ScienceDaily (Oct. 19, 2012) — 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.
This plot
shows the fractions of settled disk galaxies in four time spans, each
about 3 billion years long. There is a steady shift toward higher
percentages of settled galaxies closer to the present time. At any given
time, the most massive galaxies are the most settled. More distant and
less massive galaxies on average exhibit more disorganized internal
motions, with gas moving in multiple directions, and slower rotation
speeds. (Credit: NASA's Goddard Space Flight Center)
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Source: ScienceDaily.com .
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