How is the Kuiper Belt different from the Oort Cloud?
All of the comets in the Kuiper Belt and Oort Cloud are part of the solar system. They travel around our star the Sun, and obey the same laws of motion as the planets and their moons. However, only a very few comets come close to the Sun, where we can see them from Earth. Most comets travel on paths beyond the 9th planet Pluto, or even further out, in the Oort Cloud. Next: why astronomers get excited about comets, and our latest comet visitor.