4.4 Formation of the Solar System
Comets & Asteroids
A comet is a ball of rock and ice that orbits the sun. Comets are thought to come from a giant cloud that surrounds our solar system. Very little is known about this cloud, known as the Oort cloud.
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Between Mars and Jupiter there is a large asteroid belt. Asteroids are small rocky bodies that orbit the sun. They are thought to be debris that never quite became a planet, probably because of the huge gravity of Jupiter.
