No planet in our Solar System has 21 moons. See related question for information concerning moons in our Solar System
I don't know of any planet with exactly 21 known moons. The best answer is probably "Uranus" with 27 moons (natural satellites).
No, there are not moons or stars ON planet earth, but there are moons and stars around planet earth. == ==
Planet Mars has two moons
The planet , Venus has NO Moons.
There is no planet with exactly 33 moons.
no planet has 16 moons
The planet with the most moons is JUPITER as it has 62 moons and then SATURN with 33 moons.
Jupiter is the planet that has the most known moons in our solar system, it has 63 moons.
only the planet of Jupiter.... it has a total of 62 moons. and mercury and venus have no moons.
Planet X is a hypothetical planet that has yet to be confirmed. Therefore until it is discovered, it will not have any moons.
That would be planet Mars, and its two moons are named, "Phobos and Deimos". Mars is the only planet with exactly two moons.