Natural satellites that orbit planets are often called moons.

• There are at least 140 moons within Earth's solar system.
• Jupiter has more than 60 moons and Saturn has more than 40 moons.
• Mercury and Venus have no moons at all.
• Earth has one large moon ("The Moon").
• Mars has two tiny moons.
• Pluto has a very large moon named Charon (sometimes considered a double planet).
• Visit related resources at NASA for further reading.