Jupiter is the fifth planet from the sun and has many moons. It is surrounded by thousands of kilometers of hydrogen and helium gas. Venus and Mercury are the only planets that do not have moons orbiting them. If you were on the surface of Venus, you would be crushed by its strong pressure. Earth has an atmosphere that supports life, unlike Mercury and Mars which have little to no atmosphere. Saturn is a gas giant planet with rings and many moons, including Titan which resembles early Earth. The Moon is Earth's natural satellite and has ancient craters covering its surface. The sun is a star that can hold all the planets in our solar system in orbit and spins once every 25 days.