Asteroids are minor planets, especially of the inner Solar System. Larger asteroids have also been called planetoids.
Asteroids vary greatly in size, from almost 1000 km for the largest down to rocks just 1 meter across. The three largest are very much like miniature planets: they are roughly spherical, have at least partly differentiated interiors, and are thought to be surviving protoplanets.
Asteroids are made mostly of rock — with some composed of clay and silicate — and different metals, mostly nickel and iron. But other materials have been found in asteroids, as well.
Do you know As of October 2019, there were two asteroids with a more notable cumulative Palermo Technical Impact Hazard Scale than Apophis, though none of them have a Torino level greater than 0. On average, an asteroid the size of Apophis (370 metres) can be expected to impact Earth once in about 80,000 years.
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