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"millions of asteroid exist in the solar system asteroid belt floating in the space between the orbits of mars and jupiter.
Inside The Beltway
asteroids are dust-covered irregularly shaped rocks of varying sizes that are be-leave to be debris left over from the solar system formation.Some are so large that they are called minor planets but if you collected all millions of asteroids in the belt and formed them into a planet it would be smaller than earth moon.
impact events
An impact as large as the one that caused the extinction of the dinosaurs may be extremely rare but smaller asteroids which are also capable of mass destruction strike the earth much more frequently,
Asteroids
Asteroids are leftover rocky matter that never successfully cooled onto a planet.Most planetary astronomers still believe that the planets of the solar system formed from a nebula of gas and dust that coalesced into a disk of dust grains.
In early years of solar system dust grain collided and coalesced and the seed of asteroids comets and plants were formed.The gravity of some of the more distant planets attracted gas . And jupiter and the other gas gaints developed."