Gravitational forces combined with the motion of the planet or moon originating from the formation of the solar system.
Out of the planets in our Solar System, Jupiter has the most moons. It has 63 confirmed moons.
Moons are larger, obviously.
In our Solar System all planets have moons, except for Mercury and Venus.
The answer is there are two planets which have no moons. Venus and Mercury
Mercury and Venus do not have moons
Mercury and Venus do not have moons.
In our solar system, Mercury and Venus are the two planets which do not have moons.
There are six.
169 moons.
A solar system
About 120 planets are in our solar system.
In most cases, the moons are about as old as the planets they orbit, perhaps slightly younger. Most objects in the solar system formed when the solar system did.