jupiter's moons how many
With a total of 67 known moons â including four large moons known as the Galilean satellites â Jupiter almost qualifies as a solar system unto itself. Most of the moons of Jupiter are small, with about 50 of the satellites being less than 6.2 miles in diameter. The number of moons changes fairly frequently, with 66 and 67 being confirmed at the end of 2011.