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Dark energy that varies over time could account for puzzlingly heavy galaxy clusters in the early universe... 
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About 3,700 years ago, people on Earth would have seen a brand-new bright star in the sky. It slowly dimmed out of sight and was eventually forgotten, until modern astronomers later found its remains, called Puppis A.
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Astronomers have found two new star streams coming from the Sagittarius dwarf galaxy, reinforcing that our own Milky Way has chomped on many of its neighbors over the years. Researchers made the find using data from the Sloan Digital Sky Survey.
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In the distant reaches of the universe, almost 13 billion light-years from Earth, a strange species of galaxy lay hidden. Cloaked in dust and dimmed by the intervening distance, even the Hubble Space Telescope couldn't spy it.
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This deep image of the Virgo Cluster comprises approximately 1300 to 2000 member galaxies, forming the heart of the larger Local Supercluster, of which the Local Group is an outlying member.The image shows the diffuse light between the galaxies...
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A class of wandering stars called OB Runaways may have been thrown from home by competing binary star systems that got too close. John Matson reports.
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A new study has found a link between the size of gas halos around galaxies and the amount of new star formation going on inside. Galaxies with smaller halos have lower star birth rates.
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Some galaxies recycle stellar waste to birth new stars, others don't bother and blow it all in a star burst frenzy.
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Could the Milky Way be full of phantom, planet devouring black holes and billions of rogue, solitary planets? It looks that way. A recent simulation of black holes merger revealed that there could be literally hundreds of rogue black holes...
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The largest galaxies within the largest halos of dark matter also harbor the most massive black holes, which has led to speculation that exotic physics controls the growth of black holes and their link to massive dark matter halos.
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In 2007, a renowned international team of astronomers may have set a new record in discovering what is the most distant known galaxy in the universe. Located an estimated 13 billion light-years away, the object is being viewed at a...
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The latest discovered of such intergalactic violence a galaxy called not too poetically as FGC 1287 located at the edge of a cluster of other galaxies. New radio evidence from the Very Large Array in New Mexico has revealed that...
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The world’s largest submillimeter camera—based on superconducting technology designed by the National Institute of Standards and Technology (NIST)—is now ready to scan the universe, including faint and faraway parts never seen before.
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This newly discovered type of galaxy is like nothing astronomers have ever seen--mainly because you can't see them with the naked eye.
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Ancient stars found in the outer reaches of our Milky Way are surprisingly chock full of some of the heaviest chemical elements, which could have formed in the galaxy's early history, a new study reveals.
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In this stunning picture of the giant galactic nebula NGC 3603, the crisp resolution of the NASA/ESA Hubble Space Telescope captures various stages of the life cycle of stars in one single view.
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New observations by NASA's Hubble Space Telescope are expanding astronomers' understanding of the ways in which galaxies continuously recycle immense volumes of hydrogen gas and heavy elements. This process allows galaxies to build successive generations of stars stretching over billions of years.
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New observations by NASA's Hubble Space Telescope are expanding astronomers' understanding of the ways in which galaxies continuously recycle immense volumes of hydrogen gas and heavy elements. This process allows galaxies to build successive generations of stars stretching over billions of years. This ongoing recycling keeps some galaxies from emptying their "fuel tanks" and stretches their star-forming epoch to over 10 billion years.
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New, high-precision equipment orbiting Earth aboard the Hubble Space Telescope is now sending such rich data back to astronomers, some feel they are crossing the final frontier toward understanding galaxy evolution.
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Using its infrared vision to peer nine billion years back in time, the NASA/ESA Hubble Space Telescope has uncovered an extraordinary population of tiny, young galaxies that are brimming with star formation.
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About a month ago, a Galaxy Zoo contributor named Bruno discovered a very unique galaxy merger in the Sloan Digital Sky Survey data.
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The space between the galaxies wasn't always transparent. In the earliest times, it was an opaque, dense fog. How it cleared is an important question in astronomy.
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