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. Together, these four planets are sometimes referred to as the Jovian planets - Jovian being the adjectival form of Jupiter. Jupiter has at least 63 natural satellites. Of these, 47 are less than 10 kilometres in diameter and were only discovered since 1975. The four largest moons, known as the Galilean moons, are Io, Europa, Ganymede and Callisto. - wiki Screensaver Picture Count: 14 Screensaver Type: Slideshow Credit: All images in this screensaver provided by NASA and the ESA