Comet
/kˈɑmət/
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Definition
(noun) A small Solar System body consisting mainly of volatile ice, dust and particles of rock whose very eccentric solar orbit periodically brings it close enough to the Sun that the ice vaporises to form an atmosphere, or coma, which may be blown by the solar wind to produce a visible tail.
Sentence Examples
Halley's Comet comes round once every eighty years.
Halley's Comet will come back in 2061.
CEFR Practice Quiz
A bright ____ was visible in the night sky for several weeks.