galactic halo

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noun

astronomy a spheroidal aggregation of globular clusters, individual stars, dust, and gas that surrounds the Galaxy

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His boss, whom he admires, is waiting to meet with him about the big project.

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Words nearby galactic halo

galactic, 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 halo

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.