It has to do with the formation of the planet and happenstance. The Earth has a gigantic moon relative to the Earth's size because (it is currently theorized) when the Earth was nearly formed, it collided with another planet (Orpheus) at an oblique angle which scattered debris around the forming Earth. This debris coalesced into what is now our Moon.
Mars, Venus and Mercury did not have these types of collisions so they did not have a moon form when they were formed.
However, Mars' gravitational pull has captured its moons: Phobos and Deimos. These rocks that look like potatoes are thought to be captured from the asteroid belt.
The Jovian Planets, Jupiter, Saturn, Uranus, Neptune all have multiple moons. Most of the Jovian moons are thought to have been formed at the same time as the planets during the accretion phase of the solar system. Some Jovian moons are small captured rocks from the asteroid belt or the Kuiper Belt (the Kuiper Belt is a ring of rocks and ice left over from the formation of the solar system which revolves around the sun outside the orbit of Neptune.) The largest captured moon is thought to be Neptune's moon Triton. This moon revolves around Neptune in a "retrograde" orbit. This means the moon goes around Neptune in the opposite direction in which Neptune spins. It is about 3/4 the size of the Earth's moon and could have been a planet in its own right. But it was captured by Neptune and is doomed to crash into the planet or be torn apart by tidal forces creating a new ring system around Neptune in a few million years. Neptune has 4 known moons that are thought to be captured Kuiper Belt objects
Pluto, no longer considered a "planet" rather a "Dwarf Planet", has a moon, Charon. It is thought that both Pluto and Charon are two individually formed Kuiper Belt chunks of ice and dust that are caught in a gravitational dance.
Europa is a moon of the planet Jupiter.Europa is a moon of the planet Jupiter.Europa is a moon of the planet Jupiter.Europa is a moon of the planet Jupiter.
A moon must orbit a planet, or it isn't a moon, it's a planet.
A natural satellite that orbits a planet is a moon
No such place- ALL have some degree of gravity.
Ariel is a moon of the planet Uranus.
None. Some of the moons of Jupiter are nearly the size of Mercury, but no planet has a moon as big as the planet itself.
Pluto
Some moons can be bigger than some planets, but moons cannot be bigger than their own planet otherwise the planet would become the moon and the moon would become the planet due to the difference in size, mass and gravitational pull.
Europa is a moon of the planet Jupiter.Europa is a moon of the planet Jupiter.Europa is a moon of the planet Jupiter.Europa is a moon of the planet Jupiter.
No. In a planet-moon pair the larger object is planet.
I dont know. planet earth is mistory
Venus has no moon it is the only planet besides some of the dwarf planets that has no moon
Earth is the closest planet the moon, as it is our planet's moon and orbits Earth.
The moon is a satellite not a planet.
No. The moon orbits the planet which means the planet is larger than the moon.
A moon must orbit a planet, or it isn't a moon, it's a planet.
A planet orbits a star such as the sun. A moon orbits a planet.