meteor - when meteoroids enter Earth's atmosphere (or that of another planet, like Mars) at high speeds and burn up, called fireballs or shooting stars, asteroids - small, rocky objects that orbit the Sun, meteoroid - a solid piece of debris from an object, such as a comet or asteroid that originates in outer space and survives its passage through the atmosphere to reach the surface of a planet or moon, meteorite - a piece of solid matter from outer space that has hit the Earth, comets - frozen leftovers from the formation of the solar system composed of dust, rock, and ices. The gases form a tail that stretches millions of miles,

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