__________ keeps the planets in orbit around the sun.

The sun and all the bodies that revolve around it is the

A giant sphere of glowing gas is a

How many stars are in our solar system?

There are _____ planets.

A planet is

A _____ is a small body that orbits a planet.

The outer planets are called

Earth and the other planets closest to the sun are mostly made of

The outer planets are

The moon is a natural _____ of Earth.

True or False: An asteroid is also called a dirty snowball because it is made of ice, rock, and dust.

True or False: Pluto is a planet.

True or False: You cannot see anything beyond our solar system without a telescope.