That's a great question! Here's the breakdown of planets in our solar system and their moons:

* Mercury: No moons

* Venus: No moons

* Earth: 1 moon (Luna)

* Mars: 2 moons (Phobos and Deimos)

* Jupiter: 79 moons (including the four largest: Io, Europa, Ganymede, and Callisto)

* Saturn: 82 moons (including the famous rings)

* Uranus: 27 moons

* Neptune: 14 moons

So, all planets in our solar system except for Mercury and Venus have at least one moon.