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Galactically

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• Galactic-cluster

  noun, Astronomy. 1. . noun, Astronomy. 1. a comparatively young, irregularly shaped group of stars, often numbering up to several hundred, and held together by mutual gravitation; usually found along the central plane of the Milky Way and other galaxies. noun a loose grouping of stars Usage Note astronomy galactic cluster (gə-lāk’tĭk) See open cluster. […]

• Galactic coordinate system

  galactic coordinate system The coordinate system in which a celestial object’s position on the celestial sphere is described in relation to the structure of the Milky Way galaxy. ◇ An object’s galactic longitude is measured along the galactic equator, a great circle on the celestial sphere that follows the band of the Milky Way. The […]

• Galactic-equator

  noun, Astronomy. 1. the great circle on the celestial sphere that is equidistant from the galactic poles, being inclined approximately 62° to the celestial equator and lying about one degree north of the center line of the Milky Way. noun 1. the great circle on the celestial sphere containing the galactic plane

• 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 […]

• Galactic-latitude

  noun, Astronomy. 1. the angular distance from the galactic equator of a point on the celestial sphere.

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