This 3D simulator shows you the motion of Jupiter and of its four Galilean moons, completing our previous app named Planets. You can observe Jupiter's Great Red Spot and the smaller Jovian storms in high resolution, as well as the surface features of the moons. Imagine you are traveling in a fast spaceship that can orbit the planet and its moons, directly observing their strange surfaces. The four Galilean moons are: Io, Europa, Ganymede, and Callisto; they were independently discovered in 1610