Mars and Jupiter
Asteroids are rocky worlds revolving around the sun that are too small to be called planets. Asteroids are leftovers from the formation of our solar system about 4.6 billion years ago. Asteroids can reach as large as Ceres, which is 940 kilometres (about 583 miles) across.
The three broad composition classes of asteroids are C-, S-, and M-types.
- The C-type (chondrite) asteroids are most common, probably consist of clay and silicate rocks, and are dark in appearance. They are among the most ancient objects in the solar system.
- The S-types (‘stony’) are made up of silicate materials and nickel-iron.
- The M-types are metallic (nickel-iron).