Different planets can have different numbers of moons. For instance:

• Mercury and Venus don't have any moons.
• Earth has 1, Mars has 2
• Jupiter has 63 and Saturn has 61!
• There are many planets outside of our solar system that don't have any moons and many planets that do.

Each planet has a different number of moons. Earth, as you probably know, has one, while Mercury and Venus have none. Jupiter, Saturn, Uranus and Neptune each have numerous moons. In total, there are around 146 known moons orbiting the planets in our solar system. This number keeps changing, though, as new moons are officially confirmed to exist.

This varies from planet to planet. Mercury and Venus have no moons. Earth has one. Mars has two. Saturn has more moons than we can count, because its rings are basically composed of huge numbers of tiny moonlets!