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In Astronomy , the nebulous envelope around the nucleus of a Comet is called its coma (from the Latin word for "hair"). It is formed when the comet passes close to the Sun on its highly Elliptical Orbit ; as the comet warms, parts of it melt and/or Vaporize . The coma is generally made of Ice and Dust . Larger dust particles are left along the comet's orbital path while smaller particles are pushed away from the Sun into the comet's tail by Light Pressure {Link without Title} . This gives a comet a "fuzzy" appearance when viewed in Telescope s and distinguishes it from Star s. |
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