Asteroid
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An asteroid is a celestial body that is less than a planetoid, and are responsible for making up asteroid belts.
An asteroid was a solid object orbiting a star that was smaller than a planet, ranging from dozens of meters to hundreds of kilometers in size. Asteroids were often found in an asteroid belt within a star system.
Smaller versions of asteroids were meteoroids, which became meteors or meteor showers in atmospheres, and meteorites on impact with planets.