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- Starship joue gros cette nuit : SpaceX tente plusieurs premières qui peuvent changer la suite
Starship joue gros cette nuit : SpaceX tente plusieurs premières qui peuvent changer la suite

Move over, GPS: Navigation satellites in low-Earth orbit are making a comeback
New navigation satellites in low-Earth orbit could provide 100 times stronger signal strength compared to GPS and other global navigation satellite systems operating from higher orbital altitudesβenabling greater location accuracy within dense cities, under thick foliage, and even inside buildings. Such signals would also likely prove more resilient to interference at a time when commercial flights, maritime shipping, and even various smartphone apps face increasingly widespread disruption from GPS jamming.
That vision may start to take shape when the first six production satellites of California-based Xona Space Systems are scheduled to launch in October 2026, with early service starting in 2027. Once the full constellation of 258 Pulsar satellites has been launched in the following years, Xona claims that customers will be able to accurately pinpoint their locations anywhere on Earth to within several centimeters.
βThat added power means that we can get into that indoor environment that GPS can't get to today,β Adrien Perkins, co-founder and VP of engineering at Xona Space Systems, told Ars. βOur higher power allows you to get into those jamming environments a lot further than you would with GPS by itself.β


Β© Xona Space Systems
Move over, GPS: Navigation satellites in low-Earth orbit are making a comeback
New navigation satellites in low-Earth orbit could provide 100 times stronger signal strength compared to GPS and other global navigation satellite systems operating from higher orbital altitudesβenabling greater location accuracy within dense cities, under thick foliage, and even inside buildings. Such signals would also likely prove more resilient to interference at a time when commercial flights, maritime shipping, and even various smartphone apps face increasingly widespread disruption from GPS jamming.
That vision may start to take shape when the first six production satellites of California-based Xona Space Systems are scheduled to launch in October 2026, with early service starting in 2027. Once the full constellation of 258 Pulsar satellites has been launched in the following years, Xona claims that customers will be able to accurately pinpoint their locations anywhere on Earth to within several centimeters.
βThat added power means that we can get into that indoor environment that GPS can't get to today,β Adrien Perkins, co-founder and VP of engineering at Xona Space Systems, told Ars. βOur higher power allows you to get into those jamming environments a lot further than you would with GPS by itself.β


Β© Xona Space Systems
- Ars Technica - Gadgets
- Move over, GPS: Navigation satellites in low-Earth orbit are making a comeback
Move over, GPS: Navigation satellites in low-Earth orbit are making a comeback
New navigation satellites in low-Earth orbit could provide 100 times stronger signal strength compared to GPS and other global navigation satellite systems operating from higher orbital altitudesβenabling greater location accuracy within dense cities, under thick foliage, and even inside buildings. Such signals would also likely prove more resilient to interference at a time when commercial flights, maritime shipping, and even various smartphone apps face increasingly widespread disruption from GPS jamming.
That vision may start to take shape when the first six production satellites of California-based Xona Space Systems are scheduled to launch in October 2026, with early service starting in 2027. Once the full constellation of 258 Pulsar satellites has been launched in the following years, Xona claims that customers will be able to accurately pinpoint their locations anywhere on Earth to within several centimeters.
βThat added power means that we can get into that indoor environment that GPS can't get to today,β Adrien Perkins, co-founder and VP of engineering at Xona Space Systems, told Ars. βOur higher power allows you to get into those jamming environments a lot further than you would with GPS by itself.β


Β© Xona Space Systems
- Space
- Every SpaceX Starlink satellite has to dodge a collision almost weekly, and experts fear the worst
Every SpaceX Starlink satellite has to dodge a collision almost weekly, and experts fear the worst
SpaceX's Starlink satellites made over 355,000 collision avoidance maneuvers throughout the past year, with each satellite now dodging debris and other spacecraft on an almost weekly basis.
The numbers are based on disclosures made by SpaceX in its latest semiannual report to the Federal Communications Commission (FCC). According to the latest report, Starlink satellites performed an overall 207,152 avoidance maneuvers between December 2025 and May 2026, up nearly 60,000 from the 148,696 reported in the previous half year. That brings the yearly total to over 355,000, more than three times as many as the constellation performed in 2024. On average, each Starlink satellite performed more than 40 space dodging maneuvers per year between June 1, 2025 and May 31, 2026.
Experts fear the situation might soon get out of hand. "I think we're heading towards a situation where there will be a collision involving an operational satellite in the constellation," Hugh Lewis, a space sustainability expert and professor of astronautics at the University of Birmingham in the U.K., told Space.com. "And it will not be for the lack of trying to avoid those things. It will be in spite of all those maneuvers."
The increase coincides with the growth of the internet-beaming constellation and the overall number of satellites in space in the past five years. Starlink grew from about 6,000 satellites in 2024 to more than 10,000 as of June 2026. Over the same time period, the overall number of operational spacecraft in orbit rose from around 10,000 to about 16,000.
The SpaceX constellation orbits at altitudes between 298 miles (480 km) and 342 miles (550 kilometers) and uses an autonomous collision avoidance system that initiates a maneuver when the probability of a collision appears higher than 3 in 10 million. Lewis says that although SpaceX is "doing an excellent job" managing orbital traffic, the steep growth cannot continue without risks.
"The avoidance maneuvers reduce the probability of a collision to about one in a million, which is so small that it's negligible," Lewis said. "The problem is that if you make a million maneuvers and you have a residual probability of one in a million, you end up with an aggregate risk across your entire constellation that you can't get rid of."
Lewis points out that with the expected continued rise in avoidance maneuvers (SpaceX has applied to the FCC to increase the size of its constellation to 100,000 satellites), SpaceX will have made a million avoidance maneuvers over the lifetime of the Starlink constellation as early as June 2027. By 2030, the constellation may be making more than a million maneuvers every year. At that point, the one in a million risk of a collision may no longer be negligible at all.

Tommaso Sgobba, the Director of the International Association for the Advancement of Space Safety, told Space.com that the increase in collision avoidance maneuvers is a predictable certainty.
"The more satellites you pack into [an orbital] shell, the more pairs of satellites exist that could potentially cross paths," Sgobba wrote in an email. "Adding satellites does not just add risk one unit at a time, it multiplies the number of possible pairings. Double the satellites in a shell and you roughly quadruple the number of pairs that need to be watched."
Sgobba also said that the collision probabilities predicted are highly inaccurate as the effects of air drag, which change frequently with space weather, are currently impossible to predict.
He said that due to the vast uncertainties in satellite trajectory predictions "operators lack tools to tell a real threat from statistical confusion," adding that "satellites are frequently dodging ghosts, burning fuel and shortening their operational lives in the process."
SpaceX, being the largest constellation currently in orbit, takes the bulk of responsibilities for orbital maneuvering. Instead of communicating with the other operator to decide who will make the dodge, Starlink satellites automatically avoid other objects β both space debris fragments or operational satellites β whenever there is a conjunction alert.
Other ambitious constellations, such as Amazon LEO or China's Thousand Sails, or Qianfan, are currently being deployed, actively adding to the high number of satellites operating in low Earth orbit.

Lewis said that the only way to safely manage multiple constellations is to make sure their orbits do not intersect. That, however, is not the case based on available information. The Thousand Sails constellation, in particular, is expected to occupy similar regions as Starlink. Many of the recently announced orbital data center projects want to launch into particular orbital regions that are convenient for their operations and are therefore likely to overlap.
"The safe thing to do is to separate the constellations," Lewis said. "But then you are talking about orbital carrying capacity and the first mover benefit, because if I go into a particular altitude with my constellation, then nobody else can use it."
Sgobba calls for predicted numbers of collision avoidance maneuvers based on satellite numbers to be mandatorily disclosed to regulators before applications are granted.
"Right now, there is no clear requirement for a company to say, before launch, how many collision avoidance maneuvers a constellation of this size and density will need every year and whether the satellites carry enough fuel and automation to actually perform them all," Sgobba wrote.
"In short, the crowding of orbit is not an accident waiting to happen. It is a manageable, predictable engineering workload and the argument worth making publicly is that regulators should be treating it that way, by asking for these numbers up front rather than reacting to headlines about near misses after the fact."
- ZME Science
- The U.S. Cleared a Giant Space Mirror to Shine Sunlight After Dark and Turn Night into Day
- Space
- Space junk debris cloud discovered in high-traffic orbit 'is a potential minefield' for the costliest satellites
Space junk debris cloud discovered in high-traffic orbit 'is a potential minefield' for the costliest satellites
Tiny pieces of space junk only 2 inches (5 centimeters) in size are cluttering a valuable orbital region where some of the costliest satellites reside, a new study has found.
Researchers from the University of Warwick in the U.K. found that the geostationary orbit β a region of space at the altitude of 22,000 miles (36,000 kilometers) β is full of dangerous, previously unseen bits of space junk that could destroy satellites.
The geostationary orbit is quite unique. Satellites at this altitude circle Earth in sync with the planet's rotation, appearing permanently suspended above a fixed spot on the equator. A single satellite in the geostationary ring has a constant view of a vast portion of the globe. This feature has been taken advantage of for decades for things like TV broadcasting, internet delivery, Earth observation and weather monitoring. But, as it appears, those satellites might not be safe up there at all.
"The debris in geosynchronous orbit is a potential minefield," Stuart Eves, the studyβs co-author and space consultant at SJE Space, said in a statement. "No one in their right mind would enter a terrestrial minefield without a mine detector. Similarly, no one in their right mind should launch a satellite to GEO without an adequate debris survey."
The researchers uncovered the previously invisible debris by re-examining a dataset from an earlier space debris survey conducted by astronomers using the 8.3-foot (2.54-meter) Isaac Newton Telescope in La Palma, Canary Islands. They ran the data through new image processing algorithms to distinguish smaller and much fainter fragments than was previously possible in the distant geostationary orbit.
"The blind stacking technique is a very powerful method for improving the sensitivity limit of astronomical datasets," Ben Cooke, a research fellow at the University of Warwick's Center for Space Domain Awareness and co-author of the paper, said in the statement. "It involves testing many potential paths in an image sequence along which hidden targets might be moving and stacking the images to help bring those targets above the noise floor. This project shows a successful, real-world application of the method."
The researchers found 25 previously missed debris tracks in the images, 80% of which were caused by previously unknown objects.
The finding is concerning as space debris at such high altitudes behaves differently from that circling closer to Earth. The residual atmosphere at 22,000 miles is almost non-existent, meaning there is no air drag to force the orbital clutter spiral into the atmosphere and burn up.

"Debris in the neighborhood of the geostationary belt is particularly concerning," James Blake, also a Warwick research fellow and the studyβs co-author, said in the statement. "It's very far away, well above the Earth's atmosphere, so small objects tend to be incredibly faint and difficult to detect, and any debris that's generated will stick around indefinitely."
While orbits near Earth naturally clear up as the residual air at these altitudes slows the junk fragments down, at the higher altitude, the concentrations of such fragments will forever keep rising, making the region ever more tricky to operate in.
Moreover, the satellites that reside in this unique orbital region tend to be very large and expensive, designed for much longer missions than those making up megaconstellations in low Earth orbit. These satellites, frequently fitted with solar panels spanning 100 feet (30 meters) or more, can suffer substantial damage from a collision with the tiniest piece of junk.
"Pieces of space junk can be moving very quickly relative to one another, as much as several kilometers every second," Blake said. "The energies involved are really high, and even small debris can cause a lot of damage to very expensive satellites, so small things really matter."
The researchers are now looking to analyze additional images obtained by other telescopes around the world to get a fuller understanding of the scale of the debris contamination in the region.
The study was published in the Journal of Astronautical Sciences in June.
- Space
- The FCC just gave Reflect Orbital permission to launch its 1st space mirror to orbit. Tens of thousands more could follow
The FCC just gave Reflect Orbital permission to launch its 1st space mirror to orbit. Tens of thousands more could follow
The first of perhaps tens of thousands of sunlight-directing space mirrors just got cleared for liftoff.
California-based startup Reflect Orbital just got a license from the U.S. Federal Communications Commission (FCC) to launch and operate its first demonstration satellite, a spacecraft that will unfurl a reflective surface that measures about 60 feet (18 meters) on a side.
That satellite, called EΓ€rendil-1 is targeted to fly later this year. And it could be the first of many: Reflect Orbital aims to operate 50,000 or more such mirror-craft in low Earth orbit by 2035, beaming reflected sunlight down to a variety of customers on the surface.
"We're grateful to the FCC for recognizing the importance of testing novel technologies in space," Ben Nowack, Reflect Orbital's co-founder and CEO, said in an emailed statement on Friday (July 10).
"This license is the first step toward rigorously testing our technology's efficacy and the safeguards we have developed," he added. "We're excited to demonstrate how our technology works and to introduce transformative, clean technology the world urgently needs."
That technology could aid a variety of industries and endeavors, according to Reflect Orbital.
"Imagine the endless possibilities when sunlight is not limited by geography or time of day," the company's website reads. "A search-and-rescue team locates a missing person in minutes. A city has safer, evenly lit streets without the carbon emissions. Construction projects complete in half the time with teams able to work through the night safely."
The planned mirror constellation will also boost the productivity of solar arrays on Earth, allowing them to take more of the electricity-generating load from polluting options such as fossil fuels, according to the company.

Not everybody is thrilled about Reflect Orbital's plans, however. Satellite megaconstellations in general are controversial. Some folks object to how they're changing the night sky, for example, and others worry that deorbiting huge numbers of satellites will pollute Earth's atmosphere with heavy metals.
There are some specific concerns about Reflect Orbital's plans as well β namely, that it will introduce a new type of light pollution for people and ecosystems to deal with.
"The beam reflected by these satellites is very intense, four times brighter than the full moon, and they will be flying multiple satellites in a formation," John Barentine, an astronomer at the Silverado Hills Observatory in Tucson, Arizona and a consultant at Dark Sky Consulting, previously told Space.com.
"That will have an effect on wildlife in the directly illuminated area, but also, through atmospheric scattering, on the surrounding areas as well," he added.
Reflect Orbital stresses that it will do its best to minimize such potential impacts.
"We design for safety in three ways: 1) the light is contained within the spot, 2) the light can be turned off quickly and at any time so that none of it reaches the Earth, and 3) we can intentionally avoid sensitive areas like research observatories or protected habitats," the company's website states.
"The light is not bright enough to start fires or harm eyes, even when viewed through a telescope, and cannot be concentrated past maximum natural sunlight irradiance," it adds.
Your lost dog can now call home with the world's 1st satellite-connected dog collar
Imagine you're on a hike in a remote mountain range. Your hyperactive dog catches the scent of a deer and, powered by his hunter's instinct, disappears in the forest. He has a GPS tracker in his collar that can send his coordinates via the cellular network. But where you are, there is no mobile coverage. You keep whistling and calling but to no avail: your dog is nowhere to be seen.
That exact scenario prompted technologist Jonathan Bensamoun to develop what he describes as the world's first satellite-connected wearable device for dogs. Bensamoun is the founder and CEO of Fi, which has been manufacturing dog trackers since 2017. He first conceived the idea to make GPS devices for dogs when he adopted a young German shepherd named Thor and wanted to make sure that his hired dog walker wasn't cutting corners when taking him out for walks.
But even though the company had quickly grown into a market leader, Bensamoun kept hearing customers complain about the device's usefulness. That's where SpaceX's Starlink satellites came in.
"The number one complaint from customers is either 'I live in an area where the cellular network is not really good' or 'I get really worried about my dog when it's away from the typical suburban area. I am worried when it escapes the yard and runs into the woods," Bensamoun told Space.com.
When Starlink began delivering connectivity directly to smartphones in 2024, Bensamoun knew a solution to the problem was on its way. And on July 8, the world's first satellite dog tracking service came online.
The device combines a GPS receiver, which determines the dog's position in real time, and a simple battery-powered modem that connects to T-Mobile's cellular network, which partners with Space's Starlink system. When the dog's position registers outside a pre-defined zone, the owner receives a message via a smartphone app.
When no cell tower is within reach, the device links with an overflying Starlink satellite to complete the task. The dog owner can also set a geo fence around the dog, an area within which the dog is allowed to move without triggering an alert. When the dog crosses that virtual boundary, for example, escapes from the backyard, the tracker sends a message to the owner.

The device's battery lasts "multiple days", according to Fi, giving the desperate pet owner plenty of time to locate the refugee. To speed up the search, Fi enables the owner to send the dog signals β short bursts of vibrations or sounds β to entice it to come home voluntarily.
"You can train your dog with those vibrations and reward it with food every time they receive the vibration," said Bensamoun. "That way, they will start associating the vibration with their food being ready at home."
GPS tracking has been around for decades. In the animal realm, wild, endangered animals became the first to wear them in the 1990s. But those early devices were clunky and expensive, good for large mammals such as moose and caribou, but not fit for commercial use on pets. The technology finally shrunk to small enough dimensions in the early 2010s when first GPS dog trackers entered the market.
Today, some 11 million dogs worldwide are tracked or monitored by GPS in some form. Fi's new tracker β the Fi Ultra Direct-to-Cell tracker β takes the technology another step further by providing "nearly omnipresent connectivity," said Bensamoun.
Payloads used to dictate the terms of launch. That's finally changing.
It wasn't easy to find anyone outside of SpaceX clamoring for a rocket like Starship just 10 years ago. Today, the space industry can't wait for Starship to finally deliver.
With a payload capacity of more than 100 metric tons (220,000 pounds) to low-Earth orbit, SpaceX's new rocket is changing the thinking of just about everyone in the space industry. With the unrealized but potentially game-changing benefits of refueling, Starship could carry the same amount of payload to higher orbits, the Moon, or Mars.
It's important to note that Starship is still very much in its experimental phase, far from proving Elon Musk's loftiest claims about what it can do. Still, NASA and the US military are considering novel ways to use Starship to fly to the Moon or transport cargo to far-flung war zones. Scientists are eager to use its enormous volume to launch giant space telescopes. Competitors are taking notice. China, the strongest strategic adversary America has ever faced, is looking for its own Starship. Now, some US satellite manufacturers are adapting for the substantial capacity of the world's most powerful rocket.


Β© SpaceX
Payloads used to dictate the terms of launch. That's finally changing.
It wasn't easy to find anyone outside of SpaceX clamoring for a rocket like Starship just 10 years ago. Today, the space industry can't wait for Starship to finally deliver.
With a payload capacity of more than 100 metric tons (220,000 pounds) to low-Earth orbit, SpaceX's new rocket is changing the thinking of just about everyone in the space industry. With the unrealized but potentially game-changing benefits of refueling, Starship could carry the same amount of payload to higher orbits, the Moon, or Mars.
It's important to note that Starship is still very much in its experimental phase, far from proving Elon Musk's loftiest claims about what it can do. Still, NASA and the US military are considering novel ways to use Starship to fly to the Moon or transport cargo to far-flung war zones. Scientists are eager to use its enormous volume to launch giant space telescopes. Competitors are taking notice. China, the strongest strategic adversary America has ever faced, is looking for its own Starship. Now, some US satellite manufacturers are adapting for the substantial capacity of the world's most powerful rocket.


Β© SpaceX