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Articles in 'Astronomy'
Strange new 'species' of ultra-red galaxy discovered
— 2 Dec 2011 10:29In 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. It took the revealing power of NASA's Spitzer Space Telescope to uncover not one, but four remarkably red galaxies. And while astronomers can describe the members of this new 'species,' they can't explain what makes them so ruddy…
New NASA missions to investigate how Mars turned hostile
— 19 Nov 2011 15:46Maybe because it appears as a speck of blood in the sky, the planet Mars was named after the Roman god of war. From the point of view of life as we know it, that's appropriate. The Martian surface is incredibly hostile for life. The Red Planet's thin atmosphere does little to shield the ground against radiation from the Sun and space. Harsh chemicals, like hydrogen peroxide, permeate the soil. Liquid water, a necessity for life, can't exist for very long here - any that does not quickly evaporate in the diffuse air will soon freeze out in subzero temperatures common over much of the planet…
NASA's Hubble confirms that galaxies are the ultimate recyclers
— 18 Nov 2011 17:09New 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…
Cassini chronicles life of Saturn's giant storm
— 18 Nov 2011 17:07New images and animated movies from NASA's Cassini spacecraft chronicle the birth and evolution of the colossal storm that ravaged the northern face of Saturn for nearly a year…
Scientists find evidence for 'great lake' on Europa
— 16 Nov 2011 21:37In a significant finding in the search for life beyond Earth, scientists from The University of Texas at Austin and elsewhere have discovered what appears to be a body of liquid water the volume of the North American Great Lakes locked inside the icy shell of Jupiter's moon Europa. The paper, 'Active formation of 'chaos terrain' over shallow subsurface water on Europa,' appears as an advance online publication of the journal Nature on 16 November…
Newly merged black hole eagerly shreds stars
— 9 Apr 2011 11:52A galaxy's core is a busy place, crowded with stars swarming around an enormous black hole. When galaxies collide, it gets even messier as the two black holes spiral toward each other, merging to make an even bigger gravitational monster…
Two dying stars reborn as one
— 9 Apr 2011 11:49White dwarfs are dead stars that pack a Sun's-worth of matter into an Earth-sized ball. Scientists have just discovered an amazing pair of white dwarfs whirling around each other once every 39 minutes. This is the shortest-period pair of white dwarfs now known. Moreover, in a few million years they will collide and merge to create a single star…
Telescope ferrets out planet-hunting targets
— 9 Apr 2011 11:37Astronomers have come up with a new way of identifying close, faint stars with NASA's Galaxy Evolution Explorer satellite. The technique should help in the hunt for planets that lie beyond our solar system, because nearby, hard-to-see stars could very well be home to the easiest-to-see alien planets. The new study was published in the February issue of The Astrophysical Journal and includes co-authors Mike Bessell (Australian National University), Ben Zuckerman (UCLA), and Joel Kastner (Rochester Institute of Technology)…
Frozen comet had a watery past, University of Arizona scientists find
— 6 Apr 2011 15:46For the first time, scientists have found convincing evidence for the presence of liquid water in a comet, shattering the current paradigm that comets never get warm enough to melt the ice that makes up the bulk of their material…
Sugar-grain sized meteorites rocked the climates of early Earth and Mars
— 2 Apr 2011 11:34Bombardments of 'micro-meteorites' on Earth and Mars four billion years ago may have caused the planets' climates to cool dramatically, hampering their ability to support life, according to research published today in the journal Geochimica et Cosmochimica Acta…
World's observatories watching 'cool' star
Rocket carrying Herschel and Planck lifts off