galactic disk

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galactic disk

See galaxies; Galaxy.
Collins Dictionary of Astronomy © Market House Books Ltd, 2006

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.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.