Astronomers Uncover A Surprising Trend in Galaxy Evolution

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At www.nasa.gov

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. 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. The most distant blue galaxies in the study tend to be very different, exhibiting disorganized motions in multiple directions. There is a steady shift toward greater organization to the present time as the disorganized motions dissipate and rotation speeds increase. These galaxies are gradually settling into well-behaved disks.

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At www.nasa.gov


 

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[[VID55]][[VID56]]In my opinion, the "Big Bang" wa... by Kyle McDermott on Saturday, Oct 20, 2012 at 12:20:56 PM
The Milky Way Galaxy may have gone through the sam... by Kyle McDermott on Saturday, Oct 20, 2012 at 9:00:45 PM
(Link to above comment: Surprise! Galaxies still e... by Kyle McDermott on Saturday, Oct 20, 2012 at 9:39:20 PM