| 单词 | galactic halo |
| 释义 | galactic halonounastronomy a spheroidal aggregation of globular clusters, individual stars, dust, and gas that surrounds the Galaxy Words nearby galactic halogalactic, galactic cluster, galactic coordinate, galactic coordinate system, galactic equator, galactic halo, galactic latitude, galactic longitude, galactic nebula, galactic noise, galactic nucleus 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 halogalactic 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. |
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