Ganymede A satellite of Jupiter and the largest moon in the Solar System. It is the seventh moon and third Galilean satellite outward from Jupiter. Completing an orbit in roughly seven days, Ganymede participates in a 1:2:4 orbital resonance with the moons Europa and Io, respectively.
Ganymede Mosaic (Mar 4 1999) Credit: Galileo Project, DLR, JPL, NASA Ganymede, one of the four Galilean moons of Jupiter, is the largest moon in the Solar System. With a diameter of 5,260 kilometers it is even larger than planets Mercury and Pluto and just over three quarters the size of Mars. Ganymede is locked in synchronous rotation with Jupiter. This detailed mosaic of images from the Galileo spacecraft shows the trailing hemisphere of this planet-sized moon.
Ganymede (moon) - Wikipedia, the free encyclopedia // "Ganymede (Jupiter III) is the largest moon of Jupiter and in the Solar System, and the only moon known to have a magnetic field...[it has] an internal ocean that may contain more water than all of Earth's oceans combined... [Named] for the mythological Ganymede, cupbearer of the Greek gods and Zeus's lover."
500 million miles from the Sun lies Ganymede moon, slightly larger than the planet Mercury, orbiting Jupiter and may contain more water than all of Earth's oceans.Above an artist's concept of the moon Ganymede as it orbits the giant planet