astronomy a spheroidal aggregation of globular clusters, individual stars, dust, and gas that surrounds the Galaxy
DON’T VACILLATE! VANQUISH THIS WORD OF THE DAY QUIZ!
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Question 1 of 7
What does “vacillate” mean?
Words nearby galactic halo
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
Scientific definitions for galactic halo
A large, spherical region of relatively dust-free space surrounding a spiral galaxy such as the Milky Way. The inner regions of the galactic halo contain globular clusters of very old stars, while the outer regions are apparently occupied by large amounts of dark matter. See also MACHO.
The American Heritage® Science Dictionary Copyright © 2011. Published by Houghton Mifflin Harcourt Publishing Company. All rights reserved.