Galactic halo
noun
1.
(astronomy) a spheroidal aggregation of globular clusters, individual stars, dust, and gas that surrounds the Galaxy
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.
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noun, Astronomy. 1. the angular distance from the galactic equator of a point on the celestial sphere.
- Galactic-longitude
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.
- Galactic-nebula
noun, Astronomy. 1. a nebula in the Milky Way.
- Galactic-noise
noun 1. unidentified radio-frequency radiation originating from beyond the solar system.
- Galactic nucleus
galactic nucleus The center of a galaxy, usually small, very bright, and containing a high density of stars and other objects. ◇ An active galactic nucleus is a nucleus that emits more radiation than can be explained in terms of stars alone. Blazars and quasars are thought to be active galactic nuclei; the nuclei of […]