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galact-
galactagogue
galactan
galactic
galactic center
galactic equator
galactic halo
galactic plane
galactic year
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galactic year
ga·lac·tic year (plural ga·lac·tic years)


noun 
Definition:
 
time for Sun's orbit: the time it takes for the Sun to complete one rotation around the center of the Milky Way, approximately 220 million years
Encarta® World English Dictionary [North American Edition] © & (P)2009 Microsoft Corporation. All rights reserved. Developed for Microsoft by Bloomsbury Publishing Plc.
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