Meet Cygnus, the Swan, a high-flying constellation that looks like its namesake and has a rich mythological history.
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You are sitting still, more or less, but the galaxy beneath you is not. The Milky Way and its neighbours are tearing through space at more than two million kilometres an hour, and that motion is not random. It is the result of a tug-of-war: distant concentrations of mass pulling us forward, and a vast, near-empty region of space effectively shoving us from behind.
The speed is real and measured. The direction tells a story about how matter is spread across the universe.
The yardstick is the cosmic microwave background, the faint afterglow of the early universe that fills the sky in every direction. If we were truly at rest, it would look the same temperature all around us. It does not. It reads very slightly hotter in one direction and cooler in the opposite one, a pattern called the dipole, and that asymmetry is a Doppler effect caused by our own movement into it, much as the pitch of a siren rises as it races toward you.
Read off that dipole, the Local Group of galaxies is moving at about 631 kilometres a second relative to the background, which works out to roughly 2.3 million kilometres an hour. We are not drifting. We are racing.
Some of that motion has a long-known cause. In the direction we are heading lies the Great Attractor, a concentration of mass partly hidden behind the dust of our own galactic disc, which is why it took so long to make sense of. Beyond it sits something larger still, the Shapley Concentration, the densest collection of galaxy clusters in our part of the universe.
These overdense regions do what mass does. They pull, and the Local Group is being drawn toward them across hundreds of millions of light-years.
The pull was only half the picture, and the other half is stranger. In 2017, a team led by Yehuda Hoffman mapped the local flow of galaxies and found that the motion is also being driven by a huge, sparsely populated region on the opposite side, which they named the Dipole Repeller.
A void cannot literally push anything. But gravity is a competition between directions, and a region with very little matter exerts very little pull. With density on one side and near-emptiness on the other, the net effect is that we drift away from the emptiness as surely as if it were pushing, falling toward the fuller side of the sky. The 2017 work found that this push and the pull ahead are of roughly equal importance.
None of this is the galaxy falling toward a single dramatic point. It is the Local Group riding the large-scale lumpiness of the cosmos, sliding down the gentle gradient from where matter is thin toward where it is thick.
The map is still being sharpened. The Great Attractor lies in the so-called Zone of Avoidance, the band of sky our own galaxy blocks from view, so it is awkward to study, and the Dipole Repeller is inferred from models of how thousands of galaxies are flowing rather than from a clear photograph of nothing. The broad conclusion, that we are caught between a distant abundance of mass and a distant absence of it, is well supported. The fine detail is still being filled in.
It is a strange thing to sit with. The ground feels still, the sky looks fixed, and all the while the entire galaxy is being carried across the universe at a speed no human machine has ever approached, pulled by what is out there and pushed by what is not.
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The universe is expanding, and the expansion is speeding up. Run that forward far enough and the consequence is bleak: one by one, every galaxy beyond our own immediate neighbourhood will be carried so far away that its light can no longer reach us. The astronomers of that distant era would look up at an almost empty sky, and they would have no way, from observation alone, to ever discover that the Big Bang happened.
This is not idle speculation. It is the conclusion of a serious cosmological argument, and it says something uncomfortable about the limits of what any observer can know.
Dark energy is pushing the universe apart at an accelerating rate. The more distant a galaxy, the faster the expanding space between us carries it away, and beyond a certain distance, the cosmic horizon, that recession is effectively faster than light can close the gap. Light leaving such a galaxy now will never arrive.
As the acceleration continues, that horizon draws inward. Over roughly the next hundred billion years, and decisively over trillions, the galaxies we currently see will redshift, dim, and slip past it for good. What stays behind is our Local Group, the Milky Way and its gravitationally bound neighbours, which are held together tightly enough to resist the expansion. In time they will merge into a single galaxy, sitting alone in a black and apparently endless void.
Our confidence that the universe began in a hot, dense state rests mainly on three pillars of evidence. The far future erases all three.
The first is the redshift of distant galaxies, the observation that they are all rushing apart, which is the direct fingerprint of an expanding universe. With every other galaxy gone from view, there is nothing left to measure that motion against. The second is the cosmic microwave background, the faint afterglow of the early universe; by then it will have been stretched and diluted so far that it falls below any hope of detection. The third is the precise ratio of light elements like hydrogen and helium left over from the first minutes, and after countless generations of stars have processed that material, the primordial signal will be buried.
The physicists Lawrence Krauss and Robert Scherrer worked this through in a 2007 paper bluntly titled The Return of a Static Universe and the End of Cosmology. Their conclusion is that a future astronomer, doing careful and honest science with everything still visible, would reasonably decide they lived in a single, eternal, static galaxy. The evidence for anything more would simply be gone.
The argument is not really about the far future. It is about the reliability of observation itself.
If a whole era of intelligent observers could be doomed to a confident, well-reasoned, and completely wrong picture of the universe, then the obvious question is what we have already lost. Information from the earliest universe has been crossing our own horizon throughout cosmic history. We may be living in a privileged window, late enough that intelligence exists, early enough that the evidence of our origins is still in the sky, without any way to know how much has already gone dark.
This rests on an assumption: that dark energy goes on behaving as it does now, as a steady cosmological constant. If it weakens or changes character, the timeline shifts, and the story could be different. The scenario is the careful extrapolation of current physics, not a certainty.
It is also worth saying that the future astronomers would only be blind if their knowledge had to be rebuilt from scratch. A civilisation that kept good records could still know about the Big Bang the way we know about events we cannot witness, on the strength of evidence gathered while it lasted. That, in the end, is the quiet lesson. We happen to live at a moment when the universe will still tell us where it came from, and that will not always be true.
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Thousands of kilometres beneath the cloud tops of Neptune and Uranus, the pressure is thought to do something extraordinary to carbon. It crushes it into diamond. Those diamonds, denser than the material around them, then sink slowly toward the planet’s core, a steady glittering rain falling through the dark interior of an ice giant.
It is a striking image, and unlike many striking images about distant planets, a version of it has been produced in a laboratory.
Neptune and Uranus are not the gas giants Jupiter and Saturn. Beneath their atmospheres lies a deep, hot, dense layer rich in water, ammonia and methane, the reason they are called ice giants, though little of it is ice in any familiar sense.
Methane is the key. Its molecule is one carbon atom bound to four of hydrogen, and deep inside these planets, at pressures of millions of times Earth’s atmosphere and temperatures of thousands of degrees, that bond does not hold. The molecules are torn apart, the freed carbon is squeezed together, and under those conditions carbon’s stable form is diamond. Being heavier than its surroundings, the diamond settles downward. Repeat that across a planet, and you have diamond rain.
For a long time this was a prediction on paper. In 2017 a team led by the physicist Dominik Kraus, in a collaboration that included the Lawrence Livermore National Laboratory, made it happen and watched it occur.
Working at the SLAC National Accelerator Laboratory in California, the researchers took a thin sheet of polystyrene, the everyday plastic of disposable cups, chosen because it is built from the same carbon and hydrogen as the hydrocarbons inside the planets. They hit it with an intense optical laser to generate the crushing shock conditions of an ice giant’s interior, then used SLAC’s X-ray laser to see what formed. In the instant the shock passed, almost every carbon atom snapped into the ordered lattice of diamond. The work was published in Nature Astronomy, and described by SLAC as recreating the diamond rain of icy planets.
The diamonds in the experiment were nanometres across and lasted moments. The point was not their size but their existence: the precise chemical step at the heart of the theory, hydrocarbons splitting and the carbon crystallising into diamond, really does happen, and happens readily, under the right conditions.
Diamond rain would do real work inside a planet. As each diamond sinks, it releases gravitational energy, the way anything falling does, and across an entire mantle that adds up.
Researchers have suggested this could help explain a long-standing puzzle: Neptune radiates noticeably more heat than it receives from the distant Sun, and the slow settling of dense material is one candidate source of that extra warmth. It may also bear on the planets’ strangely tilted, off-centre magnetic fields. The rain, if it falls, is part of the machinery of these worlds, not just decoration.
It is worth being clear about the limits. No instrument has ever been inside Neptune or Uranus, and no one has seen a diamond form there. The case rests on three things that agree: the known physics of carbon under pressure, laboratory experiments that reproduce the key step with stand-in materials, and the otherwise puzzling behaviour of the planets themselves.
That is a strong case, not a photograph. Settling it properly would take a dedicated mission to the ice giants, the kind long proposed and not yet flown. Until then, diamond rain remains one of the best-supported things we cannot actually see.
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From a distance, the exoplanet HD 189733b looks like the most reassuring thing in the sky: a deep blue world, the same cobalt as Earth seen from orbit. The resemblance ends there, and it ends hard. The blue does not come from oceans. It comes from a scorching atmosphere hazed with silicate particles, the raw material of glass, in a place where that glass may fall sideways on winds of thousands of kilometres an hour.
It is, in other words, an Earth-coloured planet that is about as far from Earth-like as a planet can get.
The colour is not an artist’s guess. In 2013, astronomers using the Hubble Space Telescope measured it directly, by watching the planet’s light as it slipped behind its star and noting how the colour of the combined light changed. The dip told them what the planet alone was reflecting. The answer was a deep azure blue, and it was the first time the visible colour of a planet beyond our solar system had been pinned down.
HD 189733b sits about 63 light-years away and is what astronomers call a hot Jupiter: a gas giant the size of our own, but orbiting so close to its star that it laps it in roughly two days.
On Earth, blue is the work of water and air, sunlight scattering through the atmosphere and bouncing off oceans. It is tempting to read the same story onto any blue dot.
HD 189733b has neither ocean nor surface to speak of. It is a ball of gas, and its blue comes from high hazes laced with silicate grains that happen to scatter blue light while absorbing other colours. The outcome looks identical to Earth from far enough away. The cause could hardly be more different. Same colour, opposite reason.
The conditions that make those silicate hazes are brutal. The daytime atmosphere runs to more than 1,000 degrees Celsius, hot enough that silicates exist as vapour and then condense into tiny molten droplets of glass as they cool.
Add the wind.
Models of the planet put its atmospheric winds at around 7,000 kilometres an hour, something like seven times the speed of sound, which would drive those glass droplets horizontally rather than letting them fall in any gentle way. By one description, at that velocity a single droplet would strike with something like the energy of a small artillery shell. Hence the striking image that has stuck to this planet: rain made of glass, blowing sideways.
Two honest caveats belong with that picture. Because HD 189733b is a gas giant, there is no ground for rain to land on in the way it does on Earth; the droplets form and move within the atmosphere itself. And the sideways-glass description is an inference drawn from the silicate clouds and the modelled winds, not something anyone has photographed. It is a reasonable reading of harsh data, not a postcard.
The useful lesson here is about how much a colour can hide. A blue planet is not a watery one by default, and the most Earth-looking dot in a telescope can turn out to be a furnace where the weather is made of glass.
HD 189733b is one of the most closely studied planets outside our system precisely because it is near enough and crosses its star often enough to interrogate. The more we learn about it, the clearer the warning becomes: at interstellar distances, appearances are a starting point for questions, not an answer to them.
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Venus keeps the strangest clock and calendar in the solar system. It takes about 243 Earth days to turn once on its axis, and only about 225 Earth days to travel all the way around the Sun. On Venus, in other words, the day is longer than the year. The planet finishes a lap of the Sun before it has finished a single rotation.
It gets stranger from there, and the figures are worth pulling apart, because two different “days” are hiding in this story.
The 243-day figure is the time Venus takes to spin once relative to the distant stars, what astronomers call a sidereal rotation. It is the true turn of the planet on its axis.
But a day in the everyday sense is the gap between one sunrise and the next, and on Venus that is a different and shorter span: about 117 Earth days. The two numbers disagree because Venus is moving around the Sun while it spins, and its spin is unusually slow, so the Sun’s position in the sky is set by a tug-of-war between the planet’s rotation and its orbit rather than by rotation alone. The result, according to NASA’s figures, is a solar day of roughly 117 Earth days. Sunrise to sunrise takes nearly four Earth months.
There is one more oddity, and it is the one most people have heard. On Venus the Sun comes up in the west and goes down in the east, the reverse of what it does here.
This is because Venus rotates backwards. Nearly every planet, Earth included, spins in the same direction it orbits, which is why our Sun rises in the east. Venus turns the other way, a motion called retrograde rotation, effectively almost upside down compared with its neighbours, its axis tipped close to 180 degrees. It is also the slowest-spinning planet in the solar system, which is part of why its day runs so long. From the surface, the Sun’s daily path would run the opposite way across the sky.
Why it spins like this is not settled. The leading ideas involve either a colossal ancient impact that flipped or reversed the planet, or the slow grinding action of solar tides on its massive atmosphere over billions of years. Both remain hypotheses.
Here the romantic image needs a caveat, because nobody on Venus would watch a crisp sun lift over a western horizon.
The planet is wrapped in a dense atmosphere of carbon dioxide topped with thick clouds of sulphuric acid, and almost no direct sunlight reaches the ground as a clear beam. A surface observer, if one could survive the 460-degree heat and crushing pressure, would experience a slow, dim brightening and fading of a uniformly glowing sky over those 117 days, rather than a disc rising at a point on the horizon. The direction of the Sun would be a smear of light, not a sunrise you could photograph.
That does not change the underlying mechanics. The Sun’s light still tracks east to west across that murky sky, just without a sharp Sun to mark it.
Put together, Venus runs on a schedule that breaks every habit Earth has taught us. The day outlasts the year. The Sun, such as it is, rises in the wrong place. And the time from one dim dawn to the next is counted in months, not hours.
None of these are quirks of measurement or rounding. They follow directly from a planet that turns slowly, backwards, beneath a sky that never clears, which is a fair summary of how thoroughly Venus refuses to behave like home.
The post A Venusian day is 243 Earth days long — longer than the planet’s entire 225-day year — and because Venus rotates backwards, the Sun would rise in the west and set in the east, though only once every 117 Earth days through its thick, cloud-choked sky. appeared first on Space Daily.
Enceladus is small, only about 500 kilometres across, a moon you could lose among Saturn’s dozens. It is also one of the most interesting places in the solar system to ask whether life could exist beyond Earth. From cracks near its south pole it is constantly spraying water vapour and ice grains into space, drawn from a salty ocean hidden beneath its frozen shell, and the chemistry of that spray has made a real case for the moon being habitable.
Habitable, it is worth saying at the outset, is not the same as inhabited. Nothing living has been found there. What Enceladus has is the conditions.
NASA’s Cassini spacecraft discovered the plumes in 2005, jets of vapour and frozen droplets erupting from four warm fractures, nicknamed the tiger stripes, across the moon’s southern terrain. The material feeds one of Saturn’s faint rings and, more usefully, betrays what lies underneath: a global ocean of liquid salt water wrapped around the moon’s rocky core, kept from freezing beneath kilometres of ice.
That arrangement handed scientists an unusual gift. An ocean world that vents its own ocean into space is a world you can sample without landing, and Cassini did exactly that, flying repeatedly through the plume to taste what came out.
What the spacecraft found, over a series of passes, reads like a checklist for habitability.
There was salt, and silica, and a range of organic molecules. In 2017, the Cassini team reported molecular hydrogen in the plume, which on Earth is produced where hot rock meets water. Its presence is strong evidence of hydrothermal vents on the ocean floor, the same kind of warm, mineral-rich setting that supports thriving communities of life around Earth’s deep-sea vents, and a potential source of chemical energy.
Then, in 2023, came the ingredient that had been missing. Analysis of Enceladus ice grains revealed phosphates, the first time phosphorus had been detected in an ocean beyond Earth. Phosphorus is one of the elements life as we know it cannot do without, and on Enceladus it appears to be present at concentrations at least a hundred times higher than in Earth’s seawater. Water, energy, and the chemistry of life were now all accounted for.
The remaining question is time. A pond with the right ingredients is not enough if it freezes solid every few thousand years. For life to have a chance, the ocean would need to have stayed liquid, warm, and chemically active for a very long stretch.
Modelling suggests it could have. Enceladus is squeezed and flexed by Saturn’s gravity as it orbits, and that tidal kneading generates heat, plausibly enough to keep the ocean liquid and the vents running over geological timescales. If those models are right, the ocean has had the kind of long, stable history in which, on Earth, life took hold.
This is the part to hold loosely. How much heat the tides actually supply, and how old and stable the ocean really is, are still debated, and the estimates carry real uncertainty. That the ocean could have lasted long enough for life to emerge is a reasonable inference from the models, not a settled fact, and it is a statement about opportunity rather than about anything actually being there.
That distinction is the one worth keeping in view. Everything Cassini found describes a place where life could plausibly survive, not evidence that it does. A warm, salty, chemically rich ocean is a promising address. It is not a tenant.
Confirming whether anything lives in that ocean would take a mission built for the job, flying through the plume with instruments designed to look for the signatures of biology, or landing to sample the fresh snow of ocean spray that falls back onto the surface. Concepts for exactly that kind of mission have been proposed, and Enceladus sits high on the list of places worth the trip. For now, the honest summary is the most interesting one. A tiny moon is handing us samples of a hidden sea that has much of what life needs, and we do not yet know what, if anything, is in it.
The post Enceladus, a tiny Saturnian moon only about 500 kilometres wide, is actively venting water vapour and ice grains into space from a salty ocean hidden beneath its crust — and modelling suggests that ocean may have remained warm and chemically active for geological timescales, perhaps long enough for life to have had a chance to emerge. appeared first on Space Daily.
Mercury is the closest planet to the Sun, and for a long time that was reason enough to assume it could not hold ice anywhere. The surface in direct sunlight can reach well over 400 degrees Celsius. And yet there is water ice on Mercury, tucked into craters near its poles where the Sun has never reached, and a NASA spacecraft has confirmed it.
The claim sounds like a contradiction. The explanation is geometry.
The first sign came in 1991, when the Arecibo radio telescope in Puerto Rico bounced radar off Mercury and picked up unusually bright patches near both poles. Bright radar returns of that kind are the sort of thing water ice produces, and many of the patches lined up with large impact craters that the Mariner 10 spacecraft had mapped in the 1970s.
It was a strong hint rather than proof. Radar brightness can be caused by other materials too, so for two decades the polar patches were a promising suspect awaiting a closer look.
The reason ice is even possible on the hottest planet comes down to how Mercury sits. Its spin axis is almost perfectly upright relative to its orbit, tilted by only about a hundredth of what Earth manages. With essentially no tilt, the floors of deep craters near the poles never catch a single ray of sunlight.
Those permanently shadowed floors are among the coldest places in the solar system, far colder than anywhere on Pluto, sitting at roughly minus 170 degrees Celsius and staying there for billions of years. A planet can bake on average and still keep a few pockets that the Sun has never touched. Ice trapped in one of them has nowhere to go.
The closer look came from MESSENGER, the NASA spacecraft that orbited Mercury from 2011 to 2015. In 2012 its team reported not one measurement but three that pointed the same way.
Its neutron spectrometer detected the signature of hydrogen concentrated at the north pole, in the amounts you would expect from buried water ice. Its laser altimeter found the polar deposits were either unusually bright or unusually dark exactly where the temperature models said surface ice, or ice under a dark covering, should sit. And those thermal models tied the whole picture together. Taken together, as the mission team concluded, water ice is the main constituent of Mercury’s north polar deposits.
The convergence is the point. Any one of those readings could be argued with. Three independent methods agreeing is much harder to dismiss, which is why 2012 is when the radar suspicion became a confirmed finding.
One detail complicates the tidy image of gleaming polar ice. Across most of the deposits, the ice is not exposed at the surface at all. It is buried under a dark layer, thought to be rich in complex organic compounds, in the spots that are cold enough to preserve buried ice but a little too warm to keep it stable right at the surface.
Only in the very coldest craters does the ice sit exposed and bright. So the picture is layered: dark organic material on top, water ice beneath, with the proportions set by exactly how cold each crater floor stays.
Where the water came from is not fully settled. Impacts from comets and water-bearing asteroids are the usual explanation, with some contribution possible from chemistry driven by the solar wind. However it arrived, the cold traps near the poles held on to it.
The same phenomenon turns up at the Moon’s poles, which matters for anyone planning to use lunar ice as a resource. Mercury itself will get another visitor before long: the European and Japanese BepiColombo mission is on its way and due to settle into orbit in the coming years, carrying instruments that can sharpen what MESSENGER began. The headline is already secure. There is ice on the planet nearest the Sun, and it has been there, in the dark, for a very long time.
The post Mercury was once expected to be far too hot for ice, sitting closest to the Sun — but radar observations revealed bright patches near its poles, and NASA’s MESSENGER spacecraft later confirmed that many of them were water ice, preserved inside craters where sunlight never reaches. appeared first on Space Daily.
When the James Webb Space Telescope launched on 25 December 2021, it carried a list of 344 single points of failure. Each one was a step or a part where a single fault would have crippled the mission, with no second chance and no way to send anyone to fix it. The telescope cleared all of them. It now sits about a million miles from Earth, doing the most sensitive infrared astronomy ever attempted, on roughly the power of a household kettle.
Both halves of that are true, and both are worth taking apart, because the figures are precise and the precision is the point.
The number comes from Mike Menzel, Webb’s lead mission systems engineer at NASA, who has said the observatory launched with 344 single-point failures on its books. A single point of failure, in engineering terms, is a place where one thing going wrong takes everything with it. Most spacecraft have a handful. Webb had hundreds.
About 80 per cent of them were tied to the deployment, the slow unfolding of a telescope that had been folded up to fit inside its rocket. That sequence relied on roughly 140 release mechanisms, 70 hinge assemblies, eight motors, some 400 pulleys, and around a quarter of a mile of cable, each of which had to work on command, in order, the first time.
What made the list so unforgiving was the destination. Webb was not going to low orbit, where Hubble could be visited and repaired by astronauts five times. It was going somewhere no crew can reach, which meant the usual safety net, send someone up to fix it, did not exist. Every one of the 344 had to hold on its own.
The riskiest part was the sunshield, a five-layer screen the size of a tennis court that has to separate and tension without tearing or snagging. It is the single most complex deployment ever flown, and it is the reason so much of the risk was packed into the first two weeks.
The sunshield reached its final, tensioned shape on 4 January 2022, ten days after launch. The project manager at the time, Bill Ochs, told reporters that finishing it retired somewhere between 70 and 75 per cent of the single-point failures on the original list. The rest fell away as the mirror segments locked into place over the following days. By the end of the fortnight, the most dangerous machine NASA had ever unfolded had unfolded.
Here the popular line is right, with one number worth pinning down. The spacecraft and its four instruments run on about one kilowatt. The solar array is built to deliver closer to two kilowatts, but that extra capacity is margin, sized so the telescope still has enough as the panels degrade over its mission.
So the working figure is about a kilowatt, and a lot of household kettles draw more than that, particularly the three-kilowatt kind common outside North America. A telescope unpacking the early universe really does run on less electricity than the appliance that makes your tea.
The reason it can is the sunshield again. Webb has to keep its detectors extraordinarily cold, down to around 7 kelvin on one instrument, and cooling is usually the most power-hungry thing a cold spacecraft does. By parking the sunshield between the telescope and the Sun, Webb does most of that cooling passively, simply by sitting in deep shade, rather than by running power-hungry refrigeration. The shade that protects it also keeps its electricity bill tiny.
That deep shade only works at the right address. Webb orbits the Sun-Earth point known as L2, about 1.5 million kilometres away, near enough a million miles, where it can keep the Sun, Earth, and Moon all behind a single shield.
It also means the telescope is on its own. The same distance that makes the observatory work is the distance that made the 344 single points of failure so tense, because none of them could be reached if they jammed. The achievement was not just building something this delicate. It was building something this delicate that had to survive its own unpacking, unattended, a million miles from the nearest spanner.
It has been returning science since July 2022.
The list of 344 is now history, which is the only acceptable place for a list like that to end up.
The post 344 steps stood between the James Webb Space Telescope and total failure — any one could have ended it — and the telescope that survived them all now runs on less power than a household kettle, a million miles from Earth appeared first on Space Daily.
Relativity Space has reached orbit exactly zero times. Its only rocket flew once, in March 2023, climbed cleanly through the hardest part of the atmosphere, and then a second-stage engine quit and the vehicle fell into the Atlantic a few minutes after liftoff. On June 17, 2026, that same company announced it would build and fly a science orbiter to Mars in 2028 anyway.
The mission is the first under a newly created Interplanetary Sciences Program, run under CEO Eric Schmidt. It would carry a NASA instrument suite, double as a communications relay for whatever is operating on the Martian surface, and be paid for not by the agency but by a philanthropic backer Relativity has declined to name.
Relativity flew its 3D-printed Terran 1 a single time, on March 23, 2023. The rocket passed max-q, the point of peak aerodynamic stress, then lost its upper stage and never made orbit. A month later the company retired the small launcher to concentrate on the larger, reusable Terran R.
Terran R is a medium-class rocket roughly in the Falcon 9 weight class, with a first flight Relativity has slated for late 2026 from Cape Canaveral. Industry sources expect that to slip to 2027, a delay consistent with the development pace of nearly every new orbital-class launcher of the past decade.
The Mars orbiter would be Terran R’s interplanetary debut. If the rocket flies close to schedule, the 2028 transfer window to Mars is reachable. If it slips, the mission slips with it. There is no version of this where the orbiter beats the rocket to the pad.
The science payload comes from NASA’s Ames Research Center, which will design, build, and integrate it. The centerpiece is an atmospheric suite NASA calls Aeolus — four instruments meant to deliver the first integrated, daily, global picture of Martian winds, temperatures, dust, and clouds. A radar instrument would map subsurface ice and geology, the kind of water-resource data future crewed missions would lean on.
NASA says it will operate the instruments for at least one Martian year and build the pipeline that turns raw readings into usable science, under what it describes as its first six-year reimbursable Space Act Agreement. Relativity builds, owns, and flies the spacecraft; NASA supplies the instruments and the data processing.
Then there is the relay. The orbiter is being pitched to carry high-bandwidth laser and radio links back to Earth plus radio communications with surface assets. That matters because NASA’s working Mars relay fleet — the Mars Reconnaissance Orbiter, MAVEN, and Odyssey — is aging, with no committed replacement for the data backhaul every Mars rover depends on. A privately built relay arriving in the late 2020s would fill a hole the agency has openly worried about.
Relativity has said all of the mission’s scientific data will be released publicly. The control questions are harder. Who sets the relay schedule when multiple surface assets compete for the same downlink? What happens to a publicly funded rover if a privately owned orbiter becomes the only way to hear from it? Those answers are not in the announcement.
The mission is inseparable from Eric Schmidt. The former Google chief executive took a controlling stake and became CEO of a cash-strained Relativity in March 2025, succeeding co-founder Tim Ellis. He arrived with money and with a network of science philanthropists.
Schmidt has framed the company’s goal as making access to space routine and pushing science beyond Earth, describing the Interplanetary Sciences Program as a step built on the Terran R platform. The orbiter is meant as a proof of concept; Relativity has not detailed the missions that would follow.
It is also not the only Schmidt-adjacent payload on Terran R’s manifest. Schmidt Sciences, the philanthropic vehicle Schmidt founded with his wife Wendy, announced in January 2026 the Eric and Wendy Schmidt Observatory System. That suite includes Lazuli, a space telescope with a primary mirror larger than Hubble’s, also targeting a launch as soon as 2028 on Terran R.
Two flagship science missions, one unflown rocket, one fortune behind much of both. Whether Schmidt Sciences is the Mars orbiter’s specific backer is unconfirmed; the company will only say the funder is philanthropic.
Privately backed science is not new in itself. The Breakthrough Initiatives funded ground-based SETI work. Jared Isaacman — now NASA’s administrator — bankrolled human spaceflight before taking the job. What is new in the Relativity model is the scale of capital a Mars orbiter requires, the presence of NASA instruments aboard a privately owned spacecraft, and the folding of commercial communications into what has historically been sovereign infrastructure.
This is also not Relativity’s first private Mars plan. In 2022 the company and Impulse Space announced a Mars lander to fly on Terran R, originally targeting the 2024 window; a 2023 update pushed it to as soon as 2026, and neither company has said much about it since.
The 2028 window is getting crowded regardless. SpaceX continues to pitch Starship cargo flights to Mars in roughly the same period, without firm payload commitments. More privately developed hardware may be pointed at the planet in 2028 than at any prior window. Whether all of it actually flies is a separate question, and Mars schedules are famously elastic.
Relativity’s announcement lands at an awkward point in its own story. It still has to prove Terran R can reach orbit. It has to prove the rocket can be reused on a useful cadence. And it has to show a launch company can build, integrate, and operate a deep-space science platform — a different engineering discipline entirely.
Plenty of launch startups have promised spacecraft alongside their rockets; few delivered both. The ones that came closest — SpaceX with Dragon, Rocket Lab with its Photon bus — got there through years of incremental flight experience Relativity does not yet have. The Mars orbiter would compress that curve dramatically, or expose how steep it still is.
The schedule offers no slack. If the program slips by a single Mars window, 26 months, the orbiter becomes a 2030 or 2031 mission, and the case for it shifts with it.
For now the orbiter is instrument designs at Ames, tank hardware in a Long Beach factory, and a 2028 launch window that, like every Mars window, opens and closes on the planet’s schedule rather than anyone’s. The rocket meant to carry it has still never left the pad. Both have to work, roughly two years apart, and Mars does not hold the window open.
The post In June 2026, Relativity Space — the rocket company Eric Schmidt took over in 2025, whose one rocket has never reached orbit — said it would privately build and fly a Mars orbiter in 2028, carrying NASA’s Aeolus atmospheric instruments and doubling as a communications relay, paid for by a philanthropic backer it has not named appeared first on Space Daily.
The oldest solid material ever identified on Earth did not form on Earth, or anywhere near it. It came down inside a meteorite that fell near the town of Murchison, in country Victoria, on a spring morning in 1969. Sealed in that rock were microscopic grains of stardust, and the oldest of them formed roughly 7 billion years ago, well before the Sun.
The claim is accurate, with one detail worth keeping straight: 7 billion years is the age of the oldest grains, not of all of them.
At about 11 in the morning on 28 September 1969, people around Murchison heard a series of booms and saw a fireball trailing smoke across the sky. Fragments came down over several square kilometres, and more than 100 kilograms were eventually collected.
The rock is a carbonaceous chondrite, a primitive type rich in carbon compounds, and because the fall was witnessed and the material gathered quickly, Murchison became one of the most studied meteorites in the world. The grains that matter here are tiny pieces of silicon carbide, far smaller than a grain of sand, recovered by dissolving the surrounding rock in acid until only the most durable specks remain.
These specks are not dated the way a rock on Earth is. They are dated by how long they drifted through space.
Before they were swept into the cloud that became our solar system, the grains spent a very long time as free-floating interstellar dust. Out there they were exposed to galactic cosmic rays, high-energy particles that strike solid matter and, now and then, transform an atom inside it into a new isotope. One of those products, a form of neon, builds up at a roughly steady rate. Measure how much has accumulated, and you can work out how long the grain was adrift before it was sheltered inside the meteorite.
That is the method a team led by Philipp Heck of the Field Museum and the University of Chicago used in a study published in 2020. They measured cosmic-ray exposure ages for 40 large presolar silicon carbide grains from Murchison, the largest such dating effort of its kind.
This is where the precision matters. Most of the grains the team dated formed in the few hundred million years before the Sun, clustering around 4.6 to 4.9 billion years ago. A smaller number were older. The oldest reached about 7 billion years, roughly 2.5 billion years beyond the 4.54-billion-year age of Earth and the solar system.
So the headline figure is the extreme of the range, not the average. Even the youngest of these grains, though, still predates the Sun, which is what makes the whole population presolar. They are older than the star our planet orbits.
Each grain is a piece of another star.
Silicon carbide of this kind condenses in the cooling outflows of dying stars, the kind that puff their outer layers into space late in life. Those expelled grains travel the galaxy until some are caught up in the formation of a new system, which is how a fragment of a star that died before the Sun ended up in a paddock in Victoria.
The clustering of ages led Heck’s team to a further suggestion, offered as interpretation rather than settled fact: that many of the grains may have formed during a burst of star formation in the galaxy around 7 billion years ago, a busier-than-usual stretch of stellar birth and death. That reading is debated, and the dating itself does not depend on it.
What is not in question is the simpler thing. A rock that fell on an Australian farming town within living memory carried, intact, solid matter that is older than the Sun, the Earth, and everything else ever measured on this planet. It had been drifting for billions of years before there was a planet here to land on.
The post The oldest solid material ever found on Earth didn’t come from Earth at all — it was locked inside a meteorite that landed near Murchison, Victoria in 1969, and the stardust grains inside formed roughly 7 billion years ago, before the Sun existed. appeared first on Space Daily.
The two Voyager spacecraft, launched in 1977, each carry a gold-plated copper phonograph record holding sounds and images of Earth. On the aluminium cover of each record is a detail that gets less attention than the music: a small sample of uranium, put there so that whoever finds it can work out how long it has been travelling.
The claim that it functions as a built-in clock is true.
What needs correcting is the timescale, which is far longer than the figure usually attached to it.
The cover carries an ultra-pure source of uranium-238, electroplated onto a patch of the surface about two centimetres across rather than pressed in, with a radioactivity NASA puts at about 0.00026 microcuries. Uranium-238 is radioactive, and it decays at a fixed, well-measured rate. Half of any quantity of it turns into other elements over about 4.51 billion years, a span known as its half-life.
That steady decay is what makes it a clock. A finder who measures how much uranium-238 is left, against how much of the decay product has built up beside it, can calculate how long the process has been running. That figure is the time since the sample was placed on the spacecraft, which is to say the age of the record.
It is an elegant choice, because it needs no shared language and no working knowledge of human history. Any civilisation that understands radioactive decay arrives at the same number.
The figure commonly quoted for the record is roughly a billion years, and it is worth being clear about what that number actually describes.
A billion years is the rough estimate for how long the physical disc should survive in the near-vacuum of interstellar space, where there is little to erode it. The uranium clock is a separate matter. With a half-life of about 4.51 billion years, the sample remains readable as a clock for far longer than the disc is expected to last, and in principle for several billion years. The limit on dating the record is not the uranium running out. It is the disc itself wearing away.
So the clock does not keep time for “roughly a billion years”. It keeps time for as long as there is measurable uranium left, which is a much longer window than the object it is attached to will physically endure.
The uranium was never meant to be trusted on its own. The same cover carries a second, independent way of fixing the date, in the form of the pulsar map.
That diagram, the starburst of lines also etched on the earlier Pioneer plaques, shows the position of the Sun relative to 14 pulsars, rapidly spinning stars that flash with very regular periods. Those periods are encoded on the cover in binary. Because pulsars slow down slightly and predictably over time, a finder could compare the periods as recorded against the periods as measured, and read the gap as elapsed time.
Two clocks, built to check each other rather than to be taken on faith. If the uranium and the pulsars disagreed, that disagreement would itself be informative.
For all the care in the dating, the harder problem is the one the record cannot solve, which is reaching anyone.
The Voyagers are not aimed at any particular star, and they are in no hurry. Voyager 1 will not pass within a couple of light-years of another star for roughly 40,000 years, and even then “pass” means an enormous distance rather than an encounter. The odds that either record is ever recovered and read are, on any honest accounting, very small.
That is the part the uranium clock quietly acknowledges. The people who built it were not betting on a finder. They engineered a way to answer a question that may never be asked, and built it to stay accurate long after the civilisation that made it is gone. The clock will keep good time whether or not anyone is ever there to read it.
The post Whoever finds the Voyager Golden Record will know exactly how long it has been drifting, because the scientists who built it pressed a small sample of uranium into the cover — a built-in clock that keeps time for roughly a billion years. appeared first on Space Daily.
On 3 February 1966, a 58-centimetre Soviet sphere wrapped in airbags struck the dust of Oceanus Procellarum, bounced across the Moon, rolled to a stop, opened four petals for stability, and began sending the first photographs ever taken from the surface of another world.
The pictures did not first reach most readers through Pravda, TASS, or Soviet television. They reached them through a British newspaper scoop, because the signal from Luna 9 was unencrypted, Jodrell Bank Observatory in Cheshire was listening, and the image format looked close enough to the Radiofax technology used by newspaper picture desks.
Luna 9 was the Soviet Union’s first successful lunar soft-landing after a string of failed attempts. Earlier spacecraft had missed the Moon, struck it too hard, or failed before they could complete the descent. This one used a blunt solution: slow the main spacecraft, eject the small landing capsule just above the surface, let airbags absorb the impact, and allow the sphere to bounce until the Moon stopped it.
It worked. NASA’s archive describes Luna 9 as the first spacecraft to make a survivable landing on the Moon and return photographs from its surface, in the Oceanus Procellarum region in February 1966. The capsule was small enough to disappear in a landscape of rocks and shadows, but for a few days it became the most important camera in the Solar System.
The landing solved a technical problem and a psychological one. For years, some scientists had worried that a spacecraft might sink into a deep layer of fine lunar dust. Luna 9’s pictures showed a firmer, rock-strewn plain: rough, cratered, and hostile, but solid enough to hold a machine.
Jodrell Bank was not a passive bystander in the Space Race. The University of Manchester observatory had tracked Sputnik, followed Soviet and American spacecraft, and built a reputation for listening to missions whose governments did not always announce what they were doing in real time.
When Luna 9 reached the Moon, Sir Bernard Lovell’s team was tracking it with the great radio telescope in Cheshire. Jodrell Bank’s own history notes that the observatory received the first images transmitted from the surface of the Moon by the Soviet probe in 1966.
The crucial detail was the shape of the signal. The images were coming down line by line in a form that resembled the Radiofax technology newspapers used to transmit photographs between offices. The Soviets had built a lunar imaging system, but the receiving problem suddenly looked like something a newspaper picture desk already knew how to solve.
The Daily Express sent a portable Muirhead picture receiver to Jodrell Bank. The Science Museum Group, which holds the D-700 photographic facsimile receiver associated with the episode, describes it as the machine used to publish the first photographs taken from the surface of the Moon in 1966.
The process was almost absurdly earthly. A signal recorded from a Soviet lunar lander was played through a newspaper facsimile receiver in England, and a picture of the Moon slowly appeared as lines on paper.
The Daily Express published the images on 4 February 1966 before the Soviet authorities made their own official release. The National Air and Space Museum notes that Jodrell Bank’s intercepted version beat the Soviets to publication, although the quality was not ideal.
There was a technical reason for that imperfection. The British receiver was close enough to decode the image, but not perfectly matched to the Soviet geometry. The first newspaper readers to see the Moon from ground level saw a slightly distorted version of it.
The pictures were not spectacular in the modern sense. They were grainy black-and-white panoramas, built from scan lines, with nearby rocks, a low horizon, and the hard geometry of sunlight on an airless plain.
But they carried information no telescope on Earth could provide. The rocks had scale. The shadows had shape. The horizon looked close because the Moon is smaller than Earth, and there was no atmosphere to soften the blackness behind the stones.
Luna 9 operated on batteries and lasted only a few days. The National Air and Space Museum says the lander survived long enough to transmit a panorama from very close to the surface, while other mission summaries describe several image transmissions during its brief surface life.
That was enough. Four months later, NASA’s Surveyor 1 made the first American soft landing on the Moon, touching down on 2 June 1966. By then, Luna 9 had already shown that the surface could hold a spacecraft.
Luna 9 was not the first time Soviet engineers had turned an impossible-looking imaging problem into a working machine. In October 1959, Luna 3 became the first spacecraft to return pictures of the Moon’s far side, a story that belongs to the same lineage of capture, scan, and radio transmission.
That earlier probe used film, developed it onboard, scanned the result, and transmitted it back to Earth. As Space Daily has covered in its Luna 3 feature, the pictures were crude, but they redrew the map of the Moon.
Luna 9 brought that tradition down to the surface. Instead of showing a hidden hemisphere from space, it showed the ground itself: the place future landers, rovers, and astronauts would have to touch.
After the batteries died, Luna 9 became a silent object somewhere west of Reiner and Marius craters in Oceanus Procellarum. Its reported coordinates were approximate, and the lander was only about the size of a beach ball. From orbit, it could hide among natural rocks, shadows, and small craters.
That uncertainty is the reason the recent search should be handled carefully. A 2026 paper in npj Space Exploration by Lewis J. Pinault, Ian A. Crawford, and Hajime Yano reported several candidate artificial-looking features near the historically uncertain Luna 9 landing area, using a machine-learning system trained on Lunar Reconnaissance Orbiter Camera imagery of known Apollo landing sites.
The paper did not prove the lander has been found. It identified promising candidates near 7.03 degrees north and 64.33 degrees west, and said confirmation would require targeted follow-up imaging under better conditions. Other search efforts have proposed different candidate sites, which means the honest version is still unresolved.
The Moon is full of this kind of archaeological problem now. Lunokhod 1 was also lost for decades before modern lunar imaging helped recover it, and the Apollo sites are still studied from orbit by the shadows of objects and tracks left in dust.
Luna 9 remains different because of what it sent back before it vanished. It was not a rover trail, a reflector, or a flag. It was the first low horizon from another world, stretched through a newspaper fax machine, printed in ink before the country that landed it had finished controlling the story.
The lander is still somewhere in the Ocean of Storms, its batteries dead since February 1966, its petals open to vacuum. If one of the candidate sites is confirmed, the object will not have changed much. There is no rain on the Moon, no wind, no weather to fold the petals shut. The first camera station on another world is still sitting in the dust that made it famous.
The post When Luna 9 bounced to a stop in the Ocean of Storms in February 1966, Britain’s Jodrell Bank observatory intercepted its picture transmission, recognised the newspaper-fax format, and helped the Daily Express publish the first photographs from the Moon’s surface before the Soviets released them appeared first on Space Daily.
A small space telescope concept has been proposed to settle one of the most stubborn arguments in exoplanet science: why the galaxy seems to skip over worlds that are about 1.8 times the size of Earth. The proposed mission, called the Early eVolution Explorer (EVE), would stare at young star clusters for 2.5 years and try to catch planets while they are still being assembled — before the physics that carves the so-called radius valley has finished its work.
The mission concept, detailed in a recent arXiv preprint led by George Zhou and collaborators, has been pitched as a NASA Small Explorers (SMEX) candidate. It remains unfunded.
Of the thousands of exoplanets confirmed since the early 1990s, a strange gap shows up in the size distribution. Planets a little larger than Earth are common. Planets a little smaller than Neptune are common. Worlds right in between — about 1.6 to 1.8 Earth radii — are oddly rare. Astronomers have called this the radius valley, and they have spent more than a decade arguing about what creates it.
Two explanations dominate. The first, the shrinking gas-dwarf hypothesis, says these planets all start out puffy, with thick hydrogen and helium envelopes. Intense radiation from their young host stars strips those envelopes away. Planets that lose their atmospheres shrink into the super-Earth pile. Planets that hang on stay as sub-Neptunes. The valley is what’s left in the middle.
The second is the water-world hypothesis. It argues that these are fundamentally two different kinds of planet from birth — small rocky worlds on one side, and dense, water-rich worlds on the other, with no migration between them. A 2022 study led by University of Chicago astronomer Rafael Luque, reported in Popular Science, found that density — not radius — separated planets around red dwarf stars into three families: rocky, gaseous, and water-rich worlds that may be roughly half H2O by mass.
Both hypotheses fit the data the field currently has. That’s the problem.
To distinguish the two, astronomers need to look at planets before atmospheric stripping has run its course. If the gas-dwarf model is right, young planetary systems should be teeming with puffy sub-Neptunes that haven’t yet lost their envelopes. If the water-world model is right, those puffy planets shouldn’t be there at all — the population should look much like it does today, just younger.
The catch: young planets are scarce in the catalog. Young stars are noisy. They flare. They spot. They rotate fast. All of that makes it hard to pick out the tiny dip in starlight that signals a transiting planet.
EVE is designed around that noise problem.
The telescope would carry three separate detectors covering near-ultraviolet, optical, and near-infrared wavelengths simultaneously. Stellar flares tend to brighten dramatically in the UV while barely registering in the infrared. A real transiting planet does the opposite — it produces a roughly wavelength-independent dimming. By comparing all three channels in real time, EVE’s pipeline can flag stellar activity and isolate the planetary signal.
The observing plan calls for monitoring 30 fields of young star clusters, each for 30 days, capturing light from about 20,000 newly formed stars across the 2.5-year mission. That cadence is long enough to catch multiple transits of close-in planets and short enough to fit dozens of clusters into one mission lifetime.
The Zhou team’s modeling produces two starkly different predictions, which is what makes the mission valuable. If the gas-dwarf hypothesis is correct and young sub-Neptunes really are puffy and abundant, EVE should find roughly 100 small young planets. If the water-world hypothesis is correct, EVE should find only about five.
That’s a 20-to-1 ratio. Few exoplanet experiments offer a discriminator that clean.
A null-ish result — five planets — would not be a failure. It would be a strong constraint, and a hint that the planets we see around mature stars were largely built the way they look, rather than carved by radiation over hundreds of millions of years. A planet-rich result would close the door on water worlds as the dominant explanation for the valley.
EVE has been submitted into NASA’s Small Explorers line, the same program that has produced compact astrophysics missions like IXPE and SPHEREx. NASA’s 2026 Astrophysics Small Explorer Announcement of Opportunity set the framework for the current competition, with selected concepts moving through phased study before any flight decision.
The budget environment is tight. A House appropriations subcommittee in April advanced a fiscal year 2027 spending bill that held NASA’s overall funding flat at $24.438 billion, rejecting a White House proposal to cut the agency by 23%. Within that flat top line, science took a $1.25 billion reduction from 2026 levels, though the figure was well above the administration’s $3.9 billion request.
Flat funding is a softer landing than the proposed cuts, but it still squeezes the science portfolio. SMEX missions are relatively cheap by NASA standards — typically capped around $150 million plus launch — which is part of what makes them politically survivable in lean years. EVE’s modest scope and sharp scientific question are the kind of pitch the Explorer program was designed to reward.
The radius valley is a small feature on a histogram. The argument behind it is not. Whether sub-Neptunes are stripped gas dwarfs or born water-rich changes the inventory of potentially habitable real estate in the galaxy. It changes how astronomers interpret atmospheric measurements from JWST and future observatories. It changes which target stars are worth pointing at for biosignature searches.
It also changes the assumed history of every planet we’ve already found. A mature super-Earth that was once a puffy sub-Neptune is a very different object than one that has always been rocky — different interior chemistry, different volatile inventory, different odds of holding onto an atmosphere long enough for chemistry to get interesting.
Recent work on individual planets has hinted at how varied these worlds can be. JWST thermal-emission spectroscopy of the ultra-hot super-Earth 55 Cancri e, for instance, suggests the planet may have a volatile atmosphere sustained by a magma ocean — a configuration that doesn’t fit neatly into either side of the radius valley debate.
EVE is small, narrow, and built around a single question with a binary answer. That focus is a feature. Big flagship telescopes get justified by their flexibility — they can do many things passably. Explorer-class missions earn their slots by doing one thing better than anything else can.
The Zhou team’s bet is that catching planets young, in UV through near-infrared, around the noisiest stars in the sky, is something only a dedicated instrument can do well. If NASA agrees, the next several years could finally produce data that ends a debate the field has been having since the Kepler era.
If not, the radius valley keeps its secret a little longer.
The post There’s a strange gap in the sizes of planets across the galaxy that nobody can explain, and a proposed NASA telescope could settle it by staring at 20,000 baby stars appeared first on Space Daily.
On the morning of January 16, 1966, readers of Pravda opened the state newspaper to find a name they had never seen in print before: Sergei Pavlovich Korolev. Below it ran an obituary, and a photograph of a broad-faced, heavy-jawed man in a dark suit covered in medals. He had died two days earlier, on January 14, on an operating table at a Moscow hospital, age 59. For nearly a decade, the man who had launched Sputnik, who had put Yuri Gagarin into orbit, who had aimed probes at the Moon and Venus and Mars, had been referred to in Soviet communiqués only as Glavny Konstruktor — the Chief Designer. The world learned who he was after he was already in a coffin.
The secrecy had been deliberate. The Kremlin worried about Western assassination. It also disapproved, officially, of what it called the cult of personalities. So the architect of every Soviet space first remained an unnamed bureaucratic title, even as Khrushchev waved his rockets at the world.
Korolev was born on January 12, 1907, in Zhitomir, in what is now Ukraine. He trained under the aircraft designer Andrei Tupolev in Moscow, qualified as a pilot, and by 1933 had launched the first liquid-fuelled rocket in the USSR, according to a Guardian profile drawing on James Harford’s biography.
Then, in 1938, secret service agents arrested him as a spy. He was beaten. He confessed, under torture, to crimes of treason and sabotage he had not committed, and was sentenced to ten years’ hard labour at Kolyma, the most notorious of the Gulag camps.
He lost all his teeth there. His jaw was broken. He may have suffered a heart attack. He survived months at the gold mine before being transferred to a prison design bureau in Moscow, where he spent the rest of the war building aircraft and rockets from behind bars.
In 1945, the Red Army made him a colonel and sent him to Germany. The Soviets had seized stores of V-2 components from the Nazis, and they needed someone who could understand them. Wernher von Braun and most of his team had already defected to the Americans with several complete rockets — a head start that would shape the entire Cold War in space.
Korolev studied what was left. He slept a few hours a night. He shouted at engineers and forgave them an hour later. In 1957, he launched the Soviet R-7, the world’s first intercontinental ballistic missile, on a flight from Baikonur to the Kamchatka peninsula. He had beaten the United States to an operational ICBM.
Weeks later, on October 4, 1957, a modified R-7 placed Sputnik 1 in orbit. Korolev had insisted on the satellite being audible — the engineers bolted on transmitters loud enough that ham radio operators around the world could pick up the beep on cheap shortwave receivers, a deliberate choice we’ve written about in the story of Sputnik’s transmitter. The point was for ordinary people to hear it. They did.
The team that built Sputnik, as NPR documented on the satellite’s 50th anniversary, did not fully grasp what they had done. The political shockwave in Washington was larger than anything they had planned for. The Chief Designer kept working.
What followed was the most concentrated run of firsts in the history of spaceflight, all directed by a man whose existence was a state secret. Korolev’s bureau put the first dog in orbit, the first woman, the first multi-person crew. It directed the first spacewalk. It built the first Soviet spy satellite and the first Soviet communications satellite. It flew probes at the Moon, Venus, and Mars — all on a budget that Western analysts would later describe as a shoestring.
Each triumph was announced in the name of Soviet science, the Soviet people, the Soviet system. The man responsible was referred to, when referred to at all, as the Chief Designer. As National Review noted in a 2016 retrospective, the achievement was considered to belong to the collective.
The Kremlin had practical reasons too. A named chief designer was a target. He could be approached by Western intelligence. He could be assassinated. He could be poached. Anonymity was protection, even if it cost him every form of public recognition a scientist could earn.
On the dawn of April 12, 1961, at Baikonur, a peasant farmer’s son named Yuri Gagarin rose on a 20-storey rocket into low Earth orbit. The capsule was small. The pilot was one of the few selected cosmonauts who actually fit inside it.
One orbit. One hundred and eight minutes. Gagarin shouted Poyekhali! — let’s go — and a few minutes later was looking down at clouds and oceans no human eye had ever seen from that altitude. From orbit he radioed back what he saw — the Earth, the clouds, the curve of the horizon — and called the view beautiful.
Gagarin became an instant global celebrity. He toured capitals around the world. The Soviet system had its perfect ambassador, a short, smiling peasant’s son who could disarm hostile crowds in any capital.
Korolev, meanwhile, watched it all from behind the curtain. The cosmonaut he affectionately called his little eagle was a household name on six continents. The man who had designed the rocket, selected the pilot, and directed the mission was, officially, no one.
Five years of relentless work followed Gagarin’s flight. Korolev was already a damaged man — Kolyma had left him with a broken jaw, missing teeth, a weak heart, and what colleagues described as periodic bouts of exhaustion he refused to treat. He slept little. He lived frugally. He carried the entire human spaceflight program in his head and his shouted directives.
In January 1966, he checked into a Moscow hospital for what was meant to be routine surgery. During the procedure, complications arose. Korolev, whose jaw had been broken in the Gulag, could not be properly intubated. His weakened heart failed on the table. He died on January 14, 1966, at the age of 59.
The Politburo decided, this time, that the man should be named.
The Pravda of January 16 carried the announcement. The text identified Sergei Pavlovich Korolev as the academician who had led the design of Sputnik, of Vostok, of Voskhod, of the lunar and planetary probes. His photograph appeared above the fold. For most Soviet citizens, and for everyone outside the USSR, it was the first time they had ever seen his face or read his name in connection with the program.
His ashes were interred in the Kremlin wall, the highest honour the Soviet state could give. He received, in death, the public identity the system had denied him in life. Cosmonauts who had trained under him for years were finally permitted to acknowledge, on the record, who had run their program.
Wernher von Braun, his American counterpart, would learn the name along with the rest of the world. The two men had been racing each other for nearly two decades without von Braun knowing who he was racing.
Some historians argue the secrecy may have cost the Soviet Union the Moon. Korolev had been working on the N-1, a massive lunar rocket meant to carry cosmonauts to the surface, when he died. His successor, Vasily Mishin, was a capable engineer but lacked Korolev’s authority with the political leadership and the rival design bureaus. The N-1 failed in all four of its test launches between 1969 and 1972, each time spectacularly. The program was quietly cancelled.
By then, Armstrong and Aldrin had already walked on the Moon, atop a Saturn V designed by a publicly celebrated Wernher von Braun, who had spent the 1960s on the cover of magazines and as a fixture on American television. Whether a named, internationally lionised Korolev could have held the Soviet lunar program together is one of the great counterfactuals of the space age.
Gagarin, the face the system had built up to the world, did not outlive his mentor by long. He died on March 27, 1968, in a MiG-15 training crash near the village of Novosyolovo, age 34. He had been grounded from spaceflight after the Soyuz 1 disaster killed his friend Vladimir Komarov in 1967 — the state had decided it could not risk its biggest legend. The legend of Gagarin, as Space Daily has reported on the cosmonaut’s enduring grip on Russian memory, only grew after his death.
Both men ended up in the Kremlin wall, urns of ashes set into the brick on Red Square. The peasant’s son who had become the most photographed man in the world, and the engineer whose first photograph in any newspaper was the one printed with his obituary. They lie within a few metres of each other.
The story of how the Soviet system organised its space program — secrets, hidden designers, named cosmonauts, suppressed parachute details, invented Gagarin quotes about not seeing God in orbit — has been the subject of decades of declassification and revision, including museum exhibitions that brought Soviet space artefacts to Western audiences for the first time. Pieces of Korolev’s machines now sit behind glass in cities he was never allowed to visit while alive.
His name today is on a city — Korolyov, just outside Moscow, home to the mission control centre that still flies Russian crews to the International Space Station. It is on craters, on streets, on schools. The Chief Designer has, in the end, become one of the most recognised names in Russian science.
He has been dead for sixty years. He spent fewer than nine of his 59 years as a publicly named man, and all of those nine years he was in prison, in a design bureau, or in a Kolyma mine. The face on the front page of Pravda on January 16, 1966, belonged to someone the world had been watching for a decade without knowing it. The beeps from Sputnik. The voice from Vostok. The probes drifting toward Venus. All of it had a single signature on it, and the signature was a job title.
The world finally learned the name on a winter morning in Moscow, and by then the man it belonged to was already cooling in a hospital room.
The post In 1966, Soviet chief designer Sergei Korolev died on an operating table in Moscow at the age of 59, and two days later the newspaper Pravda printed his name and face for the first time — until that obituary, the man who launched Sputnik and put Gagarin in orbit was known publicly only as the Chief Designer appeared first on Space Daily.
Astronomers have found a bright knot of X-rays close to the centre of the Milky Way that may be the remains of a star that exploded around seventeen centuries ago. The candidate sits inside Sagittarius C, a star-forming region about 26,000 light-years from Earth, and the case for it rests on data from NASA’s Chandra X-ray Observatory and the European Space Agency’s XMM-Newton. The findings were published in The Astrophysical Journal by Zhenlin Zhu and Mark Morris of the University of California, Los Angeles, with Gabriele Ponti of Italy’s National Institute for Astrophysics and Ping Zhou of Nanjing University; a record of the paper is available via arXiv.
The word doing the heavy lifting is “possible”.
This is a supernova remnant candidate, not a confirmed one, and that distinction shapes how the whole result should be read.
The evidence is a “blob” of X-ray emission, in NASA’s own phrasing, embedded in a larger bubble of expanding gas around a young, massive star. That bubble, where radiation has stripped electrons from hydrogen, is the bright radio source known as Sagittarius C. The X-ray blob is what the team argues could be the wreckage of a massive star that collapsed and exploded.
One detail is easy to miss in the coverage. The X-ray data here is not new. It comes from five Chandra observations taken between July 2001 and August 2014, roughly 57 hours in total, combined with XMM-Newton. What is new is the analysis, not the sighting. That may be the more interesting part of the story: a result pulled from archived data that had been sitting in the record for a decade.
The most concrete number in the paper is a brightness comparison. The X-ray emission from the blob is more than ten times brighter than the X-rays from large, known clusters of bright, massive stars. That figure is the team’s main reason for discounting the obvious alternative, which is that the glow comes from a crowd of hot young stars rather than an explosion. On the available evidence, the authors do not think the star-cluster explanation fits.
There is a complication they report plainly, and it cuts against the supernova reading rather than for it. A real remnant should show enhanced amounts of elements forged in the blast, things like iron, oxygen, and silicon. The team searched for that signature and did not find it. Their suggested explanation is that the debris has already mixed into the surrounding gas, which is reasonable for an older remnant.
A non-detection is still a non-detection.
If the blob is a supernova remnant, the team estimates it is expanding at about two million miles per hour, or roughly 3.2 million kilometres per hour, and is at least about 1,700 years old. Counting back from now, “at least 1,700 years” points to an explosion around 300 AD or earlier. The “at least” is worth holding onto, because it is a floor rather than a fixed date, and the event could be considerably older.
This is not the first hint that something detonated here. Observations with NASA’s now-retired SOFIA mission had already shown an expanding shell of gas around Sagittarius C, which suggested a star had exploded in the same spot. The X-ray candidate fits that earlier clue, though fitting a prior hint is not the same as confirmation.
The reason this is worth attention is location. If it holds up, this would be one of the closest supernova remnants ever identified to Sagittarius A*, the supermassive black hole at the galactic centre. That region is dense with massive stars, strong magnetic fields, and fast-moving clouds of gas, all of which make a clean detection harder and a confirmed remnant there especially useful for studying how stars live and die in the most crowded part of the galaxy.
What would settle it is the chemistry. Deeper X-ray observations that either find the missing elemental signature, or rule it out, would do more than another brightness measurement. For now the honest summary is the one the researchers themselves use: a strong candidate, an old prior hint from SOFIA, and a heavy-element search that came back empty. Whether the blob graduates from possible to confirmed is the thing to watch.
The post Near the Milky Way’s core, NASA’s Chandra spotted an X-ray blob too bright to easily explain — over ten times brighter than massive young star clusters — and astronomers think it may be the still-expanding wreckage of a supernova that exploded around 300 AD. appeared first on Space Daily.
In March 1979, NASA’s Voyager 1 probe swept past Jupiter and, in an image taken not for science but for navigation, captured the first active volcano ever seen on a world other than Earth. The volcano was on Io, the innermost of Jupiter’s four Galilean moons. The person who found it was Linda Morabito, an optical navigation engineer at the Jet Propulsion Laboratory, who was using the picture to work out exactly where the spacecraft was.
She was not looking for a volcano. She was looking at the stars behind Io to fix the position of the probe.
The plume was in the way.
Spacecraft far from Earth can be located partly by photographing a known moon against the background stars and measuring the geometry. Voyager did this routinely. After its closest approach to Jupiter on 5 March, the probe took a set of long-exposure images of Io for exactly this purpose, the lowest-priority frames of the encounter.
On the morning of 9 March, Morabito processed one of them, taken the day before. To bring out the faint background stars she stretched the contrast of the image, and a shape appeared off the edge of Io: a large, umbrella-shaped cloud rising some 270 kilometres above the surface and catching the sunlight. Her own account describes working through the rest of the day, with colleagues, to rule out the ordinary explanations, an imaging artifact or an unknown moon behind Io. By evening the answer was clear. It was a plume from an erupting volcano, later named Pele.
When the team went back through the images Voyager had already taken, they found more. The Voyager 1 images held eight active volcanic plumes in all, on a moon no one had expected to be doing anything at all. Across the two Voyager flybys that year, the tally rose to nine erupting volcanoes.
Except that someone had expected it, just days earlier, and almost no one had noticed yet.
On 2 March 1979, three days before Voyager 1’s close pass of Io, the journal Science published a paper by Stan Peale, Patrick Cassen and Ray Reynolds titled “Melting of Io by tidal dissipation.” They argued that Jupiter’s gravity should flex Io enough to heat its interior and melt much of it, and they ended with a specific forecast: the consequences of a largely molten interior might be visible in the pictures Voyager was about to take.
The timing is hard to improve on. A theoretical paper predicted volcanism on Io, and within a week a navigation image confirmed it. Morabito has said she was unaware of the paper at the time, though others on the mission, including the project scientist Edward Stone, were already watching for anything that might bear it out. It is one of the cleaner examples in planetary science of a prediction and its confirmation arriving almost together.
The mechanism the paper described is tidal heating. Io’s orbit is not quite circular, and it is kept that way by a steady gravitational tug-of-war with two of Jupiter’s other large moons, Europa and Ganymede, whose orbits are locked in a simple ratio with Io’s. Because the orbit is slightly eccentric, the strength of Jupiter’s pull on Io rises and falls as it goes round, and the moon is squeezed and released over and over. That constant flexing generates heat through friction inside the body, enough to keep much of Io’s interior molten.
The result is the most volcanically active body in the solar system. Io is only a little larger than Earth’s Moon, yet it carries an estimated several hundred volcanoes, with plumes that can reach hundreds of kilometres into space. Its surface is constantly remade by eruptions.
Before Io, internal heat in a planet or moon was mostly explained by two things: leftover warmth from formation, and the slow decay of radioactive elements. Both favour large bodies, which hold their heat and have more radioactive material to begin with. A moon the size of Io should, by that reasoning, be cold and dead.
Tidal heating added a third source, one that does not depend on size but on orbit. That idea has travelled well beyond Io. It is now central to why scientists think Jupiter’s moon Europa and Saturn’s moon Enceladus may hold liquid water oceans beneath their ice, kept liquid by the same kind of flexing. The search for habitable environments in the outer solar system rests, in part, on the heat source that a navigation engineer stumbled onto in 1979.
Io is still erupting now, more than four decades on, and later missions have watched its volcanoes come and go. The first sighting still stands apart. It was not a planned observation by a dedicated instrument. It was a side effect of checking where the spacecraft was, found by someone careful enough to ask what the smudge on the edge of a moon actually was, three days after a paper had said it should be there.
The post In 1979, Voyager 1 flew past Jupiter and photographed an active volcano erupting on Io, the first time volcanic activity had ever been observed on a world other than Earth, spotted by a navigation engineer checking the probe’s position appeared first on Space Daily.
On the morning of May 5, 1961, Alan Shepard lay strapped on his back inside a capsule the size of a phone booth, breathing pure oxygen through a sealed pressure suit, waiting for a Redstone rocket beneath him to stop misbehaving. The countdown had already slipped past three hours. His bladder was full. The hatch was bolted shut. Mission control kept telling him to hold. Eventually, according to National Geographic’s reconstruction of the morning, Shepard told the engineers he was going to urinate inside the suit, and they let him.
The voltage sensors strapped to his chest and legs went briefly haywire. The cotton long johns beneath the silver pressure layer soaked through. The oxygen flow dried him out before liftoff. Fifteen minutes later he was the first American in space.
The episode is funny in the retelling and it almost always gets told as comedy. The serious part is what it exposed: nobody at NASA in the spring of 1961 had thought seriously about what a human body does over a four-hour hold inside a sealed suit wired to live electronics.
Freedom 7’s mission was meant to be brief. Suborbital. Up and down. The capsule reached an altitude of 116.5 miles before splashing into the Atlantic, as Astronomy magazine’s day-in-history account records. Total flight time: about fifteen minutes.
The launch prep was a different story. Shepard had been awake since the early hours of the morning. He ate breakfast, suited up, and was sealed inside Freedom 7 in the pre-dawn dark, with the hatch bolted shut roughly two hours before the scheduled 7:20 a.m. launch. That window opened and closed without a liftoff.
Weather rolled in. A small inverter on the booster started acting up. An IBM 7090 computer at Goddard wanted to be checked. Each issue cost twenty minutes, then forty, then an hour. By the time the candle was finally lit at 9:34 a.m., Shepard had been horizontal in the capsule for more than four hours.
There was no urine collection device inside the Mercury suit because the mission, as designed, did not require one. Fifteen minutes is shorter than most car commutes. The Mercury planners assumed the astronaut would empty his bladder before suit-up and be fine until splashdown.
What they did not plan for was the hold.
Shepard asked over the comm loop if he could get out and use the bathroom. The answer came back from the capsule communicator: no. Unstrapping him, opening the hatch, walking him down the gantry, suiting him back up, and resealing Freedom 7 would have cost hours and risked the whole mission. The Soviets had already put Yuri Gagarin in orbit on April 12, just three and a half weeks earlier. Every hour the U.S. delayed was another hour the rest of the world spent watching the Soviet Union look like the future.
Shepard pressed the question. According to the Smithsonian National Air and Space Museum’s account of the flight, no provision had been made for him to relieve himself, and the launch team eventually told him to go in the suit. The flight surgeons worried about the medical telemetry shorting out. The electrical engineers worried about the wires.
The Mercury biomedical harness was not subtle. Shepard had electrodes on his chest reading heart rate, a respirometer at his face mask, and thermistors reading skin temperature at several locations including his lower torso and thighs. The wiring ran through the suit and into a connector at his waist that fed the capsule’s telemetry system.
When the urine pooled, the readings spiked. Heart-rate channels jumped. Skin-temperature numbers swung. The biomedical team at the Cape watched the trace and, briefly, lost confidence in what they were looking at.
The pure oxygen environment inside the suit then did what it does in a closed, ventilated space. It evaporated the moisture. By the time the engines lit, Shepard was uncomfortable but dry, and the sensors had settled back into something readable.
Forty-five million Americans watched the launch on live television, as the WDBJ7 anniversary recap notes. None of them knew. Shepard’s now-famous instruction to the launch team was broadcast in the clear. The other parts of that conversation were not.
The popular telling of this story claims NASA redesigned every subsequent flight’s plumbing from scratch the next week. That overstates what actually happened. The fixes came in stages, and they were never as elegant as the rocket they were attached to.
Gus Grissom’s Liberty Bell 7 flight in July 1961 was the next Mercury launch and it, too, was suborbital and short. Grissom flew without a true urine collection device. By the time John Glenn was preparing to orbit the Earth in early 1962 — a flight that would last several hours — the problem could no longer be ignored. NASA engineers fitted Glenn’s suit with a modified condom catheter draining into a rubber collection bag strapped to his thigh. The design was crude. It leaked. Glenn used it anyway.
By the Gemini program, the urine collection assembly had become a standard suit component, with a one-way valve and a dump line that vented overboard. By Apollo, astronauts had dedicated devices for both liquid and solid waste, the latter being a now-infamous adhesive bag system that nobody on the lunar missions remembered fondly.
The through-line is that Shepard’s four-hour hold made the engineers stop assuming the human body would behave for the duration of the mission. Every long-duration assumption that followed — fluid management, electrolyte balance, the cooling garments under Apollo suits, the way modern spacewalk suits handle waste — traces back to the moment somebody at the Cape realized a flight surgeon’s planning chart did not survive contact with a real bladder on a real launch pad.
The other thing the Shepard story exposes is how close the United States came to not flying him at all. NASA had originally planned a crewed Mercury launch in March 1961. A test flight with the chimpanzee Ham had revealed booster problems that Wernher von Braun insisted be fixed before a human was strapped on top.
That decision pushed the first crewed Mercury launch from March to May. In the gap, on April 12, Yuri Gagarin orbited the Earth. The Soviets had won the race to put a human in space, and they would have won it by a wider margin if von Braun had been less cautious.
Shepard was furious about the delay. He had been told privately in January that he was the choice for the first flight, beating out John Glenn and Gus Grissom. He spent the next several months training for a flight that kept slipping, watching Gagarin take the prize he had been promised.
When NASA finally announced his selection publicly days before the launch, Shepard was the most rehearsed astronaut in the program. He had run the fifteen-minute profile in the simulator more than a hundred times. He had not rehearsed the four-hour wait.
In December 2021, Shepard’s daughter Laura Shepard Churchley flew to the edge of space herself, on a Blue Origin New Shepard mission named for him. The launch experienced weather delays — delays of the same flavor, if not the same scale, as the ones that left her father stranded on the pad in 1961.
Her flight lasted about ten minutes. She wore a flight suit with modern moisture-wicking layers and the kind of plumbing options her father had been denied. She did not need them. The wait on the pad was short.
There are more important facts about Alan Shepard’s flight. Freedom 7 proved that the Redstone-Mercury stack could put a human into ballistic flight and bring him home alive. It gave President Kennedy the political cover to commit, three weeks later, to a crewed lunar landing before the decade was out. It set the trajectory of American spaceflight for the next eight years and arguably the next sixty.
The plumbing story survives because it is the part of the morning that nobody planned. The trajectory was calculated to the second. The heat shield was tested to specifications. The retro-rockets were timed against tables. The bladder was not on anyone’s checklist.
That is what holds matter for. They are when the assumptions in the planning documents meet the body of the person inside the suit. Every long-duration mission since — Skylab, Mir, the ISS, the planned transit to Mars — is built on the recognition that a human inside a sealed system will, given enough time, do something the system was not designed for.
The archival footage from the launch shows Freedom 7 climbing on a pale exhaust plume against a Florida sky. The capsule looks impossibly small. The crowd on the beach looks impossibly close. The man inside is dry, just barely, and about to spend fifteen minutes earning the rest of the program’s future.
He landed in the Atlantic 302 miles downrange, was hoisted out of Freedom 7 by a helicopter from the carrier USS Lake Champlain, and reportedly asked for a glass of water.
The post In May 1961, Alan Shepard became the first American in space, but only after a four-hour hold on the launch pad left him with a full bladder and no collection device, until he finally told the launch team he would have to go inside his sealed pressure suit, briefly short-circuiting his medical sensors appeared first on Space Daily.
SpaceX’s first-generation AI data-center satellite is not a faint box in orbit. The reported AI1 design stretches about 70 meters across when deployed, carries a compute payload rated around 120 kilowatts on average and 150 kilowatts at peak, and uses up to 110 square meters of radiators to dump heat into space.
That geometry is why astronomers are watching the idea with such unease. A spacecraft that wide, reflective, and thermally exposed is not just a data-center proposal. It is a moving optical object, crossing the same dark sky that the Vera C. Rubin Observatory is about to scan with the largest digital camera ever built for astronomy.
The number attached to the plan is even stranger. SpaceX has been reported to have filed for or discussed a constellation that could eventually reach as many as 1 million orbital data-center satellites, a scale far beyond the roughly tens of thousands of satellites that already worry observatories.
The old version of this article used a stronger claim: that the full constellation would make the sky as bright as a half-moon everywhere on Earth. That claim is not used here because it could not be verified to a primary public source. The verified warning is narrower, but still severe: peer-reviewed and preprint modeling shows that very large or very bright satellite constellations can damage astronomical images through streaks, glints, detector saturation, false alerts, and added sky background.
According to Tom’s Hardware’s report on SpaceX’s AI1 design, the first-generation craft would span about 70 meters when deployed, slightly wider than the 68.4-meter wingspan of a Boeing 747-8. The same report describes an average compute load of 120 kilowatts, a 150-kilowatt peak, and operation at roughly 600 kilometers altitude.
Those figures matter because optical astronomy is sensitive to surface area, altitude, attitude, and reflectivity. A satellite does not have to look bright to the unaided eye to be damaging to a long astronomical exposure. It only has to throw enough sunlight into a detector built to capture photons from objects billions of times fainter.
The radiator figure is the detail that turns a computing story into a sky story. On Earth, a rack-scale AI system can shed heat into circulating air and water. In orbit, there is no air and no water sink. Heat has to leave through radiators, which means a spacecraft built to compute at high power also has to carry surfaces designed to face cold space.
That does not automatically mean AI1 would be disastrously bright. Brightness depends on coating, orientation, phase angle, orbital altitude, and whether the spacecraft is in deployment, parking, or operational mode. But it does mean the relevant object is not a small Starlink-like box. It is a large deployed spacecraft with solar arrays, radiators, and thermal surfaces that astronomers would need to model before they could know how much sky it changes.
The most repeated technical threshold in the astronomy debate is magnitude 7. In the astronomical magnitude system, lower numbers mean brighter objects. Venus can appear around magnitude -4, bright stars sit near magnitude 0 or 1, and the unaided human eye under dark skies generally stops around magnitude 6 or a little fainter.
For modern survey telescopes, naked-eye visibility is the wrong test. A satellite can be invisible to a person and still saturate a scientific detector. In a 2025 Rubin Observatory LSST workshop report, participants reaffirmed the recommendation that tracked low-Earth-orbit satellites should be no brighter than 7th AB magnitude for the protection of Rubin-style optical survey work.
That recommendation came after years of Starlink mitigation work. A 2020 Rubin Observatory study on LEO satellite brightness and trail effects found that the original Starlink satellites were around g magnitude 4.5, while the experimental DarkSat reached about g magnitude 6.1. The authors wrote that future darkening might reach g magnitude 7, a level at which nonlinear image artifacts could be corrected far below background noise, though the trails would still remain.
A later study of Starlink Mini brightness distributions found that the sky area containing satellites brighter than magnitudes 6 and 7 is largest during twilight. That matters for surveys looking near the Sun’s direction, including searches for near-Earth asteroids and other objects that are hardest to observe in full darkness.
SpaceX has been credited by some astronomers for engaging on brightness mitigation more seriously than many operators. That history is real. It is also the reason AI1 is being judged against a known standard rather than a vague complaint about satellites looking ugly in long-exposure photographs.
The Vera C. Rubin Observatory sits on Cerro Pachón in Chile, where its Legacy Survey of Space and Time is designed to scan the southern sky repeatedly for ten years. Its wide field, fast cadence, and enormous LSST Camera are what make it powerful. They are also what make it exposed.
Rubin is meant to catch things that move, flare, fade, or appear only once: supernovas, asteroids, distant Solar System bodies, variable stars, and optical counterparts to gravitational-wave events. A satellite trail is not just a line through a pretty picture. It can mask pixels, create residual noise, trigger false detections, and contaminate the statistical measurements that depend on clean repeated imaging.
In a 2022 Rubin satellite-avoidance study, researchers simulated Starlink and OneWeb constellations totaling about 40,000 satellites. They found that, with reasonably accurate orbit forecasts, sacrificing about 10 percent of LSST observing time could cut the fraction of visits with streaks by about half.
That is a mitigation, not a cure. The same paper noted that the need for avoidance depends on satellite brightness, glints, low-surface-brightness residuals, and the effect on alert purity and systematic errors. Those are exactly the unknowns that a very large orbital data-center constellation would multiply.
A million satellites would not behave like 40,000 satellites scaled up neatly on a spreadsheet. Launch cadence, parking orbits, orbit raising, failed units, replacements, attitude modes, and end-of-life disposal would all matter. The sky problem is not just the final architecture. It is the moving assembly line required to build and maintain it.
Astronomers already have a warning case for large deployed satellites. AST SpaceMobile’s BlueWalker 3 unfolded a large phased-array antenna in 2022, and observers quickly found that it became one of the brighter artificial objects in the night sky.
In a 2023 photometric study of BlueWalker 3, Anthony Mallama, Richard E. Cole, Scott Tilley, Cees Bassa, and Scott Harrington reported that the satellite was most frequently between magnitudes 2.0 and 3.0, and about magnitude 1.4 when near zenith. That is bright enough to rival prominent stars.
A follow-up BlueWalker 3 Redux paper found that the spacecraft later faded, with the average maximum luminosity near zenith reduced from magnitude 1.0 to 2.2. Even after that improvement, the authors wrote that it remained usually bright enough to interfere with astronomical research.
The lesson is not that AI1 would necessarily match BlueWalker 3. The spacecraft are different. The lesson is that large deployed areas in low Earth orbit can become astronomy problems immediately, and mitigation may depend on details that are hard to judge from a promotional render: the underside coating, the solar-array angle, the radiator attitude, and the exact shape of the reflectance curve.
Space Daily has also covered the broader expansion of satellite constellations and radio astronomy concerns, a parallel problem in which optical glare is only one part of a larger fight over the usable sky.
Satellite streaks are the obvious signature. A spacecraft crosses a long exposure and draws a bright line across a frame. Glints are shorter and more deceptive: a flat surface briefly catches sunlight and flashes, sometimes for milliseconds, sometimes in a way that looks less like a moving satellite and more like a sudden astrophysical event.
A 2023 study of satellite glints in ZTF and LSST-style surveys found that artificial satellites and space debris can create false point-source alerts that hinder the search for rapid transients. Using more than three years of Zwicky Transient Facility data, the authors estimated that at least 20 percent of isolated single-frame events were related to artificial satellites, with an all-sky glint rate up to 80,000 per hour.
That is the kind of noise Rubin was not built to ignore casually. A survey that watches the sky for one-off flashes has to decide whether a bright pixel is a satellite reflection, a detector artifact, a supernova, a gamma-ray burst afterglow, a kilonova, or something nobody has classified before.
If an orbital data-center satellite has large radiators, solar arrays, and changing attitude states, its glint behavior matters as much as its average brightness. The most damaging moment may not be the average pass. It may be the rare angle where a thermal or power surface sends sunlight straight into the telescope.
The strongest recent modeling does not need the unverified half-moon line. In a 2026 study of large and bright satellite constellations, European Southern Observatory astronomer Olivier Hainaut modeled direct trail losses, diffuse satellite light, and scattered sky brightness from proposed constellations.
The results separate dim satellites from bright ones. Hainaut found that a constellation of about 60,000 satellites kept fainter than the V 550-kilometer magnitude-7 recommendation would add only about one ten-thousandth of the natural dark-sky brightness. But the same study found that constellations with 1 million satellites make trails pervasive, and that extremely bright reflector-style constellations could raise the scattered sky background by 200 to 300 percent.
The study also recommended keeping the total satellite population below roughly 100,000 if field-of-view losses are to remain comparable to ordinary technical downtime. That figure is not a law of physics or an international regulation. It is a modeled guardrail for astronomy, and SpaceX’s discussed million-satellite scale sits an order of magnitude beyond it.
This is the defensible version of the warning: not that AI1 has already been proven to turn every sky into permanent moonlight, but that a million large spacecraft would push astronomy into a regime where the existing mitigation playbook was never designed to operate. At that scale, even individually managed satellites become a foreground population.
For now, the sky still changes the old way. Twilight lowers, satellites brighten and fade, and the dark between them returns. The question raised by orbital data centers is whether that darkness remains a background condition of astronomy, or becomes something telescopes have to chase between machines.
The post When SpaceX described a million AI data-center satellites, each first-generation craft stretched wider than a Boeing 747, and astronomers saw the same problem Rubin Observatory was built to hate: bright moving hardware crossing the faintest parts of the sky appeared first on Space Daily.
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