Heavyweight Stars Light Up Nebula NGC 6357
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The small open star cluster Pismis 24 lies in the core of the large emission nebula NGC 6357 in Sagittarius, about 8,000 light-years away from Earth. Some of the stars in this cluster are extremely massive and emit intense ultraviolet radiation.
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Evidence for an awesome upheaval in a massive galaxy cluster was discovered in an image made by NASA's Chandra X-ray Observatory.
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Astronomers have spotted three dozen bright, young galaxies that defy the general aging trends of the universe. The galaxies, fairly nearby and massive, are more youthful than they ought to be, based on current theory.
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A NASA satellite catches the action as a massive star smashes to smithereens. It open up a whole new universe to astronomers. By Kristen Philipkoski.
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Cambridge, MA -- Astronomers are hunting an elusive target: rogue black holes that have been ejected from the centers of their home galaxies. Some doubted that the quarry could be spotted, since a black hole must be gobbling matter from an accretion disk in order for that matter to shine.
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The first stars in the Universe may have been powered by dark matter, according to a new theory.
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With the Moon reaching New    phase on Jan. 10 and thus leaving the sky darker, now is an ideal time to get    out your binoculars and explore the profusion of open or galactic star clusters    now evident in our evening sky.
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A cosmic explosion that seems to have come out of nowhere&#x2014;thousands of light-years from the nearest collection of stars&#x2014;has left astronomers baffled.
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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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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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Three powerful bursts of energy from different regions of space could presage spectacular explosions of huge stars, astronomers just announced.
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Three powerful bursts of energy from different regions of space could presage    spectacular explosions of huge stars, astronomers just announced.
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&quot;Boring&quot; light from red dwarf star Gl
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Tonight's annual Perseid meteor shower is likely to be a spectacular show of shooting stars zipping across the night sky, according to astronomers.
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Astronomers sifting through  the radiation signals emanating from a distant black hole have separated the  emission into its two component parts, a key step in understanding how such  massive objects work.
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An embryonic star, just beginning its life as the center of a planetary system, is apparently deluged with massive rainfall as icy material vaporizes and refreezes. Astronomers are observing one such star in a nebula about 1,000 light years from Earth with the Spitzer Space Telescope.
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A powerful jet of particles from a supermassive black hole is seen blasting a nearby galaxy.