Asteroids in layman’s terms are basically pieces of fragments rock that either formed when the planets where being made or when a cosmic event happens ( like 2 planets crashing in to each other ) they can float in the darkness of space for billions of years. asteroids are minor planets, especially those of the inner Solar System. The larger ones have also been called planetoids. These terms have historically been applied to any astronomical object orbiting the Sun that did not show the disc of a planet and was not observed to have the characteristics of an active comet. As minor planets in the outer Solar System were discovered and found to have volatile-based surfaces that resemble those of comets, they were often distinguished from asteroids of the asteroid belt. In this article, the term “asteroid” refers to the minor planets of the inner Solar System including those co-orbital with Jupiter.
There are millions of asteroids, many thought to be the shattered remnants of planetesimals, bodies within the young Sun’s solar nebula that never grew large enough to become planets.