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Meteoroids refer to rocks (down to sand grain sizes) adrift in space. A meteor is a meteoroid that has entered an atmosphere. For a brief second or so there is a flash as friction
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Meteor:1:(astronomy) any of the small solid extraterrestrial bodies that hits the
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Meteor Shower N. the profusion of meteors observed when the earth passes
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meteor swarm: a group of meteoroids with similar paths
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