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asteroid (noun) a very small planet.
An asteroid is one of the many small planets orbiting between Mars and Jupiter. They are supposed to be the fragments of a planet, broken to pieces on its collision with Jupiter.
- Asteroids, though much smaller than the other planets, have to be taken into account in our calculations of the dynamics of interplanetary travel.
- That the asteroids were formed as a result of a planet's collision with Jupiter is the most usually accepted theory.