comet

Noun
  1. referred to in: astronomy, uranology - the branch of physics that studies celestial bodies and the universe as a whole
    is a type of: estraterrestrial body, extraterrestrial object - a natural object existing outside the earth and outside the earth's atmosphere
    has:
    • coma - (astronomy) the luminous cloud of particles surrounding the frozen nucleus of a comet; forms as the comet approaches the sun and is warmed
    • nucleus - (astronomy) the center of the head of a comet; consists of small solid particles of ice and frozen gas that vaporizes on approaching the sun to form the coma and tail

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