Asteroids are astronomical objects within our solar system that can made out of either mainly of carbon,silicon or metallic elements. Asteroids form a belt that can be found between planet Mars and planet Jupiter.Some Asteroids are large enough to be classified as dwarf planets.
The largest Asteroid is called Ceres which is just 450 km in radius. The sum mass of all of the Asteroids in our solar system only constitute 4% of the mass of our moon.
asteroid belt