Astronomers Uncover A Surprising Trend in Galaxy Evolution
Incredible new Hubble pix: Barred Spiral Galaxy NGC 6217 by NASA Goddard Photo and Video
License (according to Flickr): Attribution License
License (according to Flickr): Attribution License
A study of 544 star-forming galaxies observed by the Keck and Hubble telescopes shows that disk galaxies like our own Milky Way unexpectedly reached their current state long after much of the universe's star formation had ceased. Over the past 8 billion years, the galaxies lose chaotic motions and spin faster as they develop into settled disk galaxies. Credit: NASA's Goddard Space Flight Center 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.
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Keck
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| -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." |
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Technology: Hubble Space Telescope
Overall Sentiment: 0.0468683
Relevance: 0.651987
Technology: Hubble
Overall Sentiment: 0
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FieldTerminology: Milky Way
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Source : http://www.nasa.gov/topics/universe/features/galaxy-evol.html
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A study of hundreds of galaxies 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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