Asteroid

Asteroid are the left over of the formation of our solarsystem, They are small and rocky. Although asteroids orbit the sun like planets, they are much smaller than planets. Most asteroid are found in the asteroid belt.

Source : nasa.gov

Most of this ancient space rubble can be found orbiting the Sun between Mars and Jupiter within the main asteroid belt. Asteroids range in size from Vesta the largest at about 329 miles (530 kilometers) in diameter to bodies that are less than 33 feet (10 meters) across. The total mass of all the asteroids combined is less than that of Earth's Moon.