In Depth | Moons – NASA Solar System Exploration There are hundreds of moons in our solar system – even asteroids have been found to have small companion moons Of the terrestrial (rocky) planets of the inner solar system, neither Mercury nor Venus have any moons at all, Earth has one and Mars has its two small moons
In Depth | Earths Moon – NASA Solar System Exploration Earth's only natural satellite is simply called "the Moon" because people didn't know other moons existed until Galileo Galilei discovered four moons orbiting Jupiter in 1610
In Depth | Saturn Moons – NASA Solar System Exploration Doing so bought Cassini time – more than a decade – to linger and watch Saturn’s exotic zoo of 80-plus moons like no spacecraft before Cassini looked, listened, sniffed and even tasted Saturn’s moons, and what it learned about them is nothing less than extraordinary
In Depth | Uranus Moons – NASA Solar System Exploration Cordelia and Ophelia are shepherd moons that keep Uranus' thin, outermost "epsilon" ring well defined Between them and Miranda is a swarm of eight small satellites unlike any other system of planetary moons
Planet Compare - NASA Solar System Exploration NASA’s real-time science encyclopedia of deep space exploration Our scientists and far-ranging robots explore the wild frontiers of our solar system
In Depth | Our Solar System – NASA Solar System Exploration There are more than 200 known moons in our solar system and several more awaiting confirmation of discovery Of the eight planets, Mercury and Venus are the only ones with no moons
In Depth | Proteus – NASA Solar System Exploration Overview Proteus is one of the largest of Neptune's known moons, although it is not as big as Triton The moon has an odd box-like shape and if it had just a little more mass it would be able to transform into a sphere Proteus orbits Neptune about every 27 hours