galactic year


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galactic year

See cosmic year.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006
The following article is from The Great Soviet Encyclopedia (1979). It might be outdated or ideologically biased.

Galactic Year

 

the period of revolution of the sun and the stars closest to it around the center of the Milky Way System. Usually it is this quantity that is considered the period of rotation of the Milky Way System. (The period of revolution varies among stars that are located at different distances from the center of the Milky Way System.) The galactic year is equal to about 180 million earth years.

The Great Soviet Encyclopedia, 3rd Edition (1970-1979). © 2010 The Gale Group, Inc. All rights reserved.
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What will be the significance of the Anthropocene rock layer and the ultimate legacy of the human race when, in 230 million years, our star, having completed another galactic year, returns to this quadrant?
Younger, chaotic ring structures, says Schechter, are 1 or 2 galactic years old (a galactic year being one rotation of the galaxy), ranging anywhere from 100 million to 200 million years.
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