Most of the major planets – all except Mercury and Venus – have moons. Pluto and some other dwarf planets, as well as many asteroids, also have small moons. Saturn and Jupiter have the most moons, with dozens orbiting each of the two giant planets. Moons come in many shapes, sizes, and types.

Why don t all planets have moons?

Venus and Mercury are the only planets in our solar system with no moons. That's primarily because they're too small and too close to the Sun to retain a moon, and Venus's motion is too unusual. The other planets and dwarf planets in our solar system have at least one moon, but Mars may lose one in 10-50 million years.

Do any planets have 3 moons?

The terrestrial planets, Mars, Earth, Venus, and Mercury only have three moons between them. Venus and Mercury have none while Earth has the Moon and Mars has Phobos and Deimos. However, it's the Jovian planets that are teeming with moons.