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Bolide is a general term for any object originating in space that collides with the Earth or explodes in the atmosphere. It covers meteorites, asteroids and comets. In astronomy, the term is often used to describe a meteor that is brighter than magnitude -4 — about as bright as the planet Venus — and is used synonymously with “fireball.” In geology, bolide is generally used to describe a meteorite or asteroid that leaves an impact crater, and tends to be employed where there is insufficient information for a more specific description.