spiral nebula

Definitions of spiral nebula
  1. noun
    a galaxy having a spiral structure; arms containing younger stars spiral out from old stars at the center
    synonyms: spiral galaxy
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    Andromeda galaxy
    a spiral galaxy in the constellation of Andromeda that is visible to the naked eye
    type of:
    extragalactic nebula, galaxy
    (astronomy) a collection of star systems; any of the billions of systems each having many stars and nebulae and dust
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