NASA launched the Extreme Ultraviolet Explorer satellite, or EUVE, on June 7, 1992, to conduct an all-sky survey at wavelengths inaccessible from the ground. The first satellite designed to operate in the short-wave ultraviolet range, its “objectives included discovering and studying UV sources radiating in this spectral region, and analyzing effects of the interstellar mediumContinue reading "June 7, 1992: The Extreme Ultraviolet Explorer launches"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 6: Albireo returns By the time the sky is dark around 10 P.M. local daylight time, the constellation Canes Venatici is still more than 70° high in the west. The Hunting Dogs hold our target for tonight: M63, also known asContinue reading "The Sky Today on Sunday, June 7: The sky’s sunflower"

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“Extraterrestrial Cause for the Cretaceous-Tertiary Extinction,” by physicist Luis Alvarez, geologist Walter Alvarez, Frank Asaro, and Helen Michel, was published in Science June 6, 1980. In it, the authors propose that an asteroid crashing to Earth was responsible for the death of the dinosaurs 65 million years ago. (The timeline was later amended to 66Continue reading "June 6, 1980: The asteroid impact theory"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 5: Check in on Mars Look east around 11 P.M. local daylight time, and you’ll see three bright stars forming a triangle — this is the famous Summer Triangle asterism, which flies high overhead in the middle of short summer nights.Continue reading "The Sky Today on Saturday, June 6: Albireo returns"

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Carl Parnell, taken from Dawlish, Devon, UK The Jellyfish Nebula (IC 443 or Sharpless 2–248) is the remnant of a supernova that went off some 30,000 years ago in Gemini. Filling the top half of the image is a glowing molecular complex threaded by multiple dark nebula (LDN 1565–8). The supernova debris plowing into thisContinue reading "Sky nettle"

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Understanding the nature of our cosmos requires an accurate map of how galaxies are spread throughout it. For decades, astronomers suspected that something vast lurked behind the Milky Way’s dense, dusty disk in our sky. There were indirect, subtle distortions present in galaxy motions that we could see, showing unexplained gravitational pulls. But the structureContinue reading "Giant supercluster discovered hiding behind the Milky Way"

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NASA has told crew aboard the International Space Station (ISS) to resume normal operations, ending a roughly two-hour period in which five astronauts sheltered inside a docked SpaceX capsule. The shelter order came Friday morning as a precautionary measure to protect crew while Russian cosmonauts attempted a fix on the Zvezda service module’s transfer tunnelContinue reading "ISS crew back to normal after emergency shelter order"

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NASA announced new contracts for the rovers and landers that will lay the groundwork for the agency’s proposed $30-billion Moon Base — some of which they plan to launch as soon as this fall — during a May 26 press conference. The announcement offered the most detailed look yet into the Moon Base plan NASAContinue reading "How NASA plans to build a Moon Base"

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On June 5, 1819, British mathematician and astronomer John C. Adams was born in Cornwall. The first to predict the existence of Neptune, he wrote in his journal on July 3, 1841: “Formed a design in the beginning of this week of investigating, as soon as possible after taking my degree, the irregularities in theContinue reading "June 5, 1819: The birth of John C. Adams"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 4: Jupiter passes south of Pollux Now that the Red Planet is rising roughly an hour before the Sun, let’s check in on Mars in the predawn sky. The nearby world now has time to climb well above the horizon, leadingContinue reading "The Sky Today on Friday, June 5: Check in on Mars"

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Friday, June 5Standing some 50° high in the south by 10 P.M. local daylight time, M5 is a fabulous globular cluster well within the reach of any instrument, from binoculars to telescopes. It is even visible to some observers without optical aid at all on a clear, dark night, so if your southern horizon isContinue reading "The Sky This Week from June 5 to 12: Jupiter and Venus meet"

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Marco Wong, taken from Sussex, U.K. The Milky Way’s bright star fields and dense dust lanes arch above the chalk cliffs of Beachy Head and the English Channel in this wide-field nightscape. The photographer used a Canon DSLR and a 28mm f/1.4 lens to take a tracked vertical panorama of five panels of stacked skyContinue reading "Milky Way over Beachy Head"

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One of the earliest recorded eclipses is found in the Shijing, a collection of ancient poetry whose compilation is credited to Confucius. The eclipse in question occurred during the Zhou dynasty. Though the exact date is uncertain, some astronomers have pointed to the total eclipse of June 4, 781 B.C.E. (though this would have only been aContinue reading "June 4, 781 B.C.E: A great eclipse in China"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 3: Juno stands still Jupiter passes 6° due south of Pollux at 7 A.M. EDT, although neither object is visible in the daylit sky. Instead, check out the scene after sunset this evening, with Jupiter still south of Pollux and alsoContinue reading "The Sky Today on Thursday, June 4: Jupiter passes south of Pollux"

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The brainchild of George Ellery Hale, the 200-inch Hale Telescope was dedicated June 3, 1948, at Palomar Observatory in California. In promoting and fundraising for the project, Hale had a firm science agenda for the scope, but also wrote more fancifully of “the lure of the uncharted seas of space”; though he died in 1938,Continue reading "June 3, 1948: Hale Telescope dedicated"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 2: Titan stands close to Saturn Asteroid 3 Juno is stationary at 3 P.M. EDT, standing still against the stars of Aquila the Eagle. The large main-belt world is in far eastern Aquila and doesn’t rise until an hour before midnight.Continue reading "The Sky Today on Wednesday, June 3: Juno stands still"

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New observatories and spacecraft missions are probing environments in our solar system that could potentially host life but have long remained hidden. Icy moons like Saturn’s Enceladus and Jupiter’s Europa likely contain oceans beneath frozen outer shells. But a layer of ice prohibits space probes from sampling them directly. Exploring these icy moons is almost forensic: Their surfaces keep aContinue reading "Scientists used a method from ecology to identify whether icy moons could hold conditions for life"

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📷: Greg Meyer from Phoenix, Arizona The Antenna Galaxies (NGC 4038/9; at left) in Corvus are one of the most famous examples of interacting galaxies. As the two galaxies merge, gravitational tidal forces have flung their stars out into long tails. At right are the galaxy NGC 4027 and its smaller companion NGC 4027A. TheContinue reading "A galactic collision"

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About 63 hours after its launch, Surveyor 1 landed on the Moon on June 2, 1966. The 2,200-pound (998 kilograms) craft touched down inside a 62-mile (100 kilometers) crater north of Flamsteed Crater in Oceanus Procellarum, or the Ocean of Storms. Surveyor 1 took more than 11,000 photos, and measured the Moon’s temperature and theContinue reading "June 2, 1966: Surveyor 1 lands on the Moon"

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Looking for a sky event this week? Check out our full Sky This Week column.  June 1: Mercury at its best Titan, Saturn’s brightest moon, is located near its parent planet for the next two days. Visible in the early-morning sky, you’ll find Titan just northeast of Saturn this morning.  Spotting Saturn is easy — rising shortlyContinue reading "The Sky Today on Tuesday, June 2: Titan stands close to Saturn"

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