How many moons are in our solar system?

They have lots of moons. Jupiter, for instance, has 53 moons! The most well-known are Io (pronounced eye-oh), Europa, and Callisto. Jupiter also has the biggest moon in our solar system, Ganymede. These moons are so big you can see them with just a pair of binoculars. read more

In this region of the Solar System, every planet has a substantial system of Moons; in the case of Jupiter and Saturn, reaching perhaps even into the hundreds. So far, a total of 170 moons have been confirmed orbiting the Outer Planets, while several hundred more orbit minor bodies and asteroids. read more

Moons in our Solar System As of October 2008, there are known natural moons orbiting planets in our Solar System. moons orbit the "full-size" planets (Mercury, Venus, Earth, Mars, Jupiter, Saturn, Uranus, and Neptune), while moons orbit the smaller "dwarf planets" (Ceres, Pluto, Haumea, Makemake, and Eris). read more

Five spacecraft have achieved enough velocity to travel beyond the boundaries of our solar system. Voyager 1 crossed into interstellar space in 2012. Voyager 2 and New Horizons are still active and will eventually transition to the space between the stars. read more