extragalactic nebula

extragalactic nebula

n (Astronomy) the former name for galaxy

Thesaurus

Noun

1.

extragalactic nebula - (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust; "`extragalactic nebula' is a former name for `galaxy'"galaxyastronomy, uranology - the branch of physics that studies celestial bodies and the universe as a wholeaggregation, collection, accumulation, assemblage - several things grouped together or considered as a wholespiral galaxy, spiral nebula - a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the centerGreat Attractor - a massive grouping of galaxies in the direction of Centaurus and Hydra whose gravitational attraction is believed to cause deviations in the paths of other galaxiesMilky Way, Milky Way Galaxy, Milky Way System - the galaxy containing the solar system; consists of millions of stars that can be seen as a diffuse band of light stretching across the night skystar - (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interiorcosmos, macrocosm, universe, world, existence, creation - everything that exists anywhere; "they study the evolution of the universe"; "the biggest tree in existence"cosmic dust - clouds of particles or gases occurring throughout interstellar space