Astronomers Uncover a Surprising Trend In Galaxy Evolution | Essentials

Astronomers Uncover a Surprising Trend In Galaxy Evolution

Incredible new Hubble pix: Barred Spiral Galaxy NGC 6217 by NASA Goddard Space Flight Center
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Excerpt:

WASHINGTON -- A comprehensive study of hundreds of galaxies observed by the Keck telescopes in Hawaii and NASA's Hubble Space Telescope has revealed an unexpected pattern of change that extends back 8 billion years, or more than half the age of the universe. "Astronomers thought disk galaxies in the nearby universe had settled into their present form by about 8 billion years ago, with little additional development since," said Susan Kassin, an astronomer at NASA's Goddard Space Flight Center in Greenbelt, Md. , and the study's lead researcher. "The trend we've observed instead shows the opposite, that galaxies were steadily changing over this time period." Today, star-forming galaxies take the form of orderly disk-shaped systems, such as the Andromeda Galaxy or the Milky Way, where rotation dominates over other internal motions.

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Galaxy Milky Way Hubble Space Telescope Star Johns Hopkins University Andromeda Galaxy Universe Astronomy

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Susan Kassin

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Sentiment	Quote
-0.286451	"Astronomers thought disk galaxies in the nearby universe had settled into their present form by about 8 billion years ago, with little additional development since," said Susan Kassin, ...
-0.136185	"Astronomers thought disk galaxies in the nearby universe had settled into their present form by about 8 billion years ago, with little additional development since," said Susan Kassin, an astronomer at NASA's Goddard Space Flight Center in Greenbelt, Md., and the study's lead researcher. "The trend we've observed instead shows the opposite, that galaxies were steadily changing over this time period."
Sentiment Stats:	Number of Quotes: 2 Aggregate Sentiment: -0.422636 Mean: -0.211318 Standard Deviation: 0

Benjamin Weiner

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Organization: NASA

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FieldTerminology: Milky Way

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A comprehensive study of hundreds of galaxies observed by the Keck telescopes in Hawaii and NASA's Hubble Space Telescope has revealed an unexpected pattern of change that extends back 8 billion years, or more than half the age of the universe.

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Astronomers Uncover a Surprising Trend In Galaxy Evolution

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Source : http://www.nasa.gov/home/hqnews/2012/oct/HQ12-364_Hubble_Galaxy_Evolution.html

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Full Content: http://www.nasa.gov/home/hqnews/2012/oct/HQ12-364_Hubble_Galaxy_Evolution.html

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