comet

  1. Noun.  (astronomy) A celestial body consisting mainly of ice, dust and gas in a (usually very eccentric) orbit around the Sun and having a "tail" of matter blown back from it by the solar wind as it approaches the Sun.
  2. Noun.  A celestial phenomenon with the appearance given by the orbiting celestial body.

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This entry was last updated on RefTopia from its source on 3/20/2012.