Gravity. As the planet rotates it's mass holds it's moons within it's orbit. The larger the planet the stronger is its gravitational pull.
moon Actually, anything that orbits a planet is called a satellite. Natural examples are moons, but man-made ones are things like the telescopes sent up from earth.
Planet X is a hypothetical planet that has yet to be confirmed. Therefore until it is discovered, it will not have any moons.
A natural satellite (or moon), usually orbits a major planet.
Both asteroids and moons can be rocky. An asteroid orbits the Sun while a moon orbits a planet. Mars has two moons (Deimos and Phobos) that are most likely former asteroids.
That would be Mercury. Venus also has no moons, but does not move as fast as Mercury.
A planet orbits a star. A moon orbits a planet or dwarf planet.
The sun does not orbit around the moon. The earth orbits the sun and the earths moon (every planet has 1 or more moons) orbits earth.
Moons don't orbit stars; they orbit planets. If it's a moon, then it orbits a planet. If it orbits a star, then it isn't a moon, it's a planet.
A moon is an object that orbits a planet. A planet cannot orbit another planet.
moon Actually, anything that orbits a planet is called a satellite. Natural examples are moons, but man-made ones are things like the telescopes sent up from earth.
A moon, or perhaps many moons.
Titan is one of Saturn's moons.
The satellite Triton is on the planet Neptune. It is the largest of Neptune's moons. Neptune has 13 moons. It orbits in the opposite direction if its planet's rotation.
Mercury. It is the closest planet to the sun and so orbits at the fastest speed and in the shortest time, just 88 days. Venus also has no moons and orbits very quickly, since it is only the second planet out. Not as quickly as mercury though.
Planet X is a hypothetical planet that has yet to be confirmed. Therefore until it is discovered, it will not have any moons.
mecur
All the planets except Venus and Mercury have moons.