spiral galaxy

Noun
  1. A galaxy having a spiral structure;
    Arms containing younger stars spiral out from old stars at the center (synset 108288378)
    is a 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
    subtypes: andromeda galaxy - a spiral galaxy in the constellation of Andromeda that is visible to the naked eye
    same as: spiral nebula

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