The Moons of Jupiter Screensaver - Version 1.1 The free screensaver, The Moons of Jupiter, was created by RateMyScreensaver.com and contains 14 high resolution images of the moons of Jupiter. Jupiter is the fifth planet from the Sun and the largest planet within the solar system. It is two and a half times as massive as all of the other planets in our solar system combined. Jupiter, along with Saturn, Uranus, and Neptune, is classified as a gas giant.