Pulsating red giants hide inside deceptive shells
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An optical illusion has caused astronomers to overestimate the size of a class of giant stars by a factor of two, according to new observations.
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Holy belching quasars, Batman NASA astronomers think they have identified a pair of supermassive black holes, or quasars, that look like they are teetering on the brink of huge explosions.â¦
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Sometimes the biggest rewards are hiding out of sight.
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NASA's Mars orbiters have spotted &quot;skylights&quot; apparently leading to cavernous underground spaces on Mars.  The discovery is fueling interest in potential underground habitats and sparking searches for caverns elsewhere on the Red Planet.
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Two monster cosmic clouds could hold the solution to the mystery of the missing matter -- immense amounts of celestial stuff that somehow has eluded detection.
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Proof that certain double star systems can erupt in full-blown explosions and then continue to flare up with smaller bursts has been spotted by the ultraviolet eyes of NASA's Galaxy Evolution Explorer.
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The universe has a huge hole in it that dwarfs anything else of its kind. The discovery caught astronomers by surprise.
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Lately, supernovas have become signal events in the life of the cosmos, as told by modern science.
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In a solar system thousands of light years away, a star about half the size of our sun is being orbited by two planets that seem like smaller versions of Jupiter and Saturn, astronomers report
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By SETH BORENSTEIN   Associated Press writer  CAPE CANAVERAL, Fla. -- Stargazers will get a rare triple planetary treat this weekend with Jupiter, Mercury and Mars appearing to nestle together in the predawn skies.
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Gas giants that orbit close to their stars likely migrated inward, shaking up debris that could coalesce into Earthlike worlds, new computer models predict.
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It's a rock! It's a coral! No, it's an octopus. Watch an underwater "master of disguise" literally change its spots to avoid predators and stalk prey.
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Some spectacular companies are hiding in an unlikely place.
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The Chandra X-ray Observatory has re-imaged a familiar scene of a relatively nearby exploded star, revealing new details of the chaotic aftermath.
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The girths of three red giants are measured - stars which are more than 1.5 billion km across.
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New images obtained by a sharp-eyed Martian satellite reveal that some Red Planet features once thought to have been carved by flowing water were in fact created by other processes.
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Astronomers spot a space oddity in Earth's neighbourhood: a dead star with unusual characteristics.