Mike John, Content Explorer, MCA, Los Angeles, California, USA
Answered Mar 05, 2019
Jupiter has many moons, about 79 known and there are probably many unknown as well. There are four very large moons which are known as the Galilean moons. Ganymede, Callisto, Lo, and Europa, with Ganymede being the largest in our solar system at 5268 km or 3273 miles in diameter, this moon is made up of rock and ice with the temperatures ranging from -171 F to -297 F.
The moon is named after the Trojan prince who was known for his beauty and the Greek translation is Cup bearer to the Gods. Ganymede is about 665,000 miles away from the surface of Jupiter, and it takes approximately 7 Earth days to orbit the planet.