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galactic disk

   Also found in: Wikipedia 0.01 sec.
galactic disk [gə′lak·tik ′disk]
(astronomy)
The flat distribution of stars and interstellar matter in the spiral arms and plane of the Milky Way Galaxy.
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There used to be this assumption that our position in the galaxy was static, that a star was in the same position in the galactic disk it was in when it was formed," James Wadsley of McMaster University told AFP.
Astronomers looking for life in all the wrong places: study by AFP / AFP Global Edition
Galactic disks arise several billion years after halos do.
Twin history by Science News
Because of the remnant's outgoing motion, theorists have proposed that the star that became Kepler's supernova was, in fact, born in the galactic disk with a partner star.
Explosive tales: a modern look at two old supernovas by Cowen, Ron / Science News
 
 
 
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