extragalactic nebula

Definitions of extragalactic nebula
  1. noun
    (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'”
    synonyms: galaxy
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    Magellanic Cloud
    either of two small galaxies orbiting the Milky Way; visible near the south celestial pole
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    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
    Andromeda galaxy
    a spiral galaxy in the constellation of Andromeda that is visible to the naked eye
    type of:
    accumulation, aggregation, assemblage, collection
    several things grouped together or considered as a whole
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