Frozen Planets There are about ten trillion comets floating in | ＳＰ￠ＣＥ.

Frozen Planets There are about ten trillion comets floating in the solar system, and each is the size of a mountain and is a frozen mass of dust and snow; That is, it is a giant cosmic snowball. These comets gather to form clouds called "the Oort cloud" and surround the planets of the solar system. The closest edge of this cloud is about 60,000 million km from us, and the farthest edge is about 7 million million km away. Even the closest comets we do not see because they are small and far away, and no comet can be seen from them except when they separate from the cloud and launch into space towards the sun.