(astronomy) a spheroidal aggregation of globular clusters, individual stars, dust, and gas that surrounds the Galaxy
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.
noun, Astronomy. 1. the angular distance from the galactic equator of a point on the celestial sphere.
noun, Astronomy. 1. the angular distance in degrees measured eastward in the galactic plane from a radius drawn from the earth as center to the constellation Sagittarius.
noun, Astronomy. 1. a nebula in the Milky Way.
noun 1. unidentified radio-frequency radiation originating from beyond the solar system.