extragalactic nebula
Noun
-
(astronomy) a collection of star systems;
Any of the billions of systems each having many stars and nebulae and dust (synset 108287963)"`extragalactic nebula' is a former name for `galaxy'"referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a wholeis a type of: accumulation, aggregation, assemblage, collection - several things grouped together or considered as a wholesubtypes:- spiral galaxy, spiral nebula - a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center
- great 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 galaxies
- milky 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 sky
specific instances: magellanic cloud - either of two small galaxies orbiting the Milky Way; visible near the south celestial polemember holonym: star - (astronomy) a celestial body of hot gases that radiates energy derived from thermonuclear reactions in the interiorbelongs to: cosmos, creation, existence, macrocosm, universe, world - everything that exists anywheresubstance holonym: cosmic dust - clouds of particles or gases occurring throughout interstellar spacesame as: galaxy
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