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galactic US English

Of or relating to a galaxy or galaxies, especially the Milky Way galaxy

galactic acid US English

= lactic acid.

galactic belt US English

The Milky Way.

galactic disc US English

(Originally) the disc of the galaxy, as represented in the sky by the Milky Way; (later also) the relatively thin, disc-shaped outer part of any spiral galaxy.

galactic halo US English

A roughly spheroidal part of many spiral galaxies that surrounds the disc and the bulge and is more diffuse, containing stars that are older; specifically that of the galaxy to which the solar system belongs, which contains stars and globular clusters.

galactic pole US English

Either of the two opposite points of the sky situated at 90 degrees north and south of the galactic equator.

galactic wind US English

An outward flow of hot gas from a galaxy following an event such as a period of star formation or the outburst of a supernova.

galactic centre US English

The central point or zone of the galaxy.

galactic circle US English

The central line or zone of the Milky Way across the sky; specifically = galactic equator.

galactic noise US English

Unidentified radio-frequency radiation coming from beyond the solar system

galactic plane US English

The plane defined by the galactic equator.

galactic system US English

The system of galactic coordinates.

galactic cluster US English

The cluster of stars including the sun and the Milky Way (now disused).

galactic equator US English

The great circle passing as closely as possible through the densest parts of the Milky Way

galactic latitude US English

The latitude of a point on the sky measured from the galactic equator.

galactic longitude US English

The longitude of a point on the sky measured from a reference point on the galactic equator, usually defined either by the direction of the centre of the galaxy or by the intersection of the galactic and celestial equators.

galactic nucleus US English

The central part of a galaxy; specifically that of the Milky Way galaxy.

galactic cannibalism US English

The process by which a galaxy attracts matter from a neighbouring galaxy by gravitation, growing at its expense.

galactic concentration US English

A tendency for stars (or other celestial objects) to occur in greater abundance closer to the galactic equator.

galactic coordinate US English

Either of a pair of coordinates comprising respectively galactic latitude and longitude.

active galactic nucleus US English

A compact region at the centre of a galaxy which emits an abnormally large amount of radiation in one or more parts of the electromagnetic spectrum.

extragalactic US English

Situated, occurring, or originating outside the Milky Way galaxy

intergalactic US English

Of, relating to, or situated between two or more galaxies