Thursday, June 18, 2009

Unusual Shape of Exploded Star Puzzles Scientists


Penn State astronomers have used NASA's Chandra X-ray Observatory to produce a new image of a ghostly exploded star with an unusual shape in a galaxy near the Milky Way. Astronomers think the object may be the remains of a white-dwarf star that disintegrated in a thermonuclear explosion, known as a Type Ia supernova, but it does not look like other likely Type Ia remnants found in our own Milky Way galaxy.

The research that led to the new image of this object was led by Penn State University astronomers Sangwook Park and Jae-Joon Lee, and was presented at the 214th meeting of the American Astronomical Society in Pasadena, California, on 9 June 2009. The strange object, known as SNR 0104-72.3 (SNR 0104 for short), is in the Small Magellanic Cloud galaxy, which is a neighbor of our Milky Way galaxy.

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Mobile DNA Elements in Woolly Mammoth Genome Give New Clues to Mammalian Evolution


The woolly mammoth died out several thousand years ago, but the genetic material they left behind is yielding new clues about the evolution of mammals. In a study published online in Genome Research, scientists at Penn State have analyzed the mammoth genome looking for mobile DNA elements, revealing new insights into how some of these elements arose in mammals and shaped the genome of an animal headed for extinction.

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