Interesting facts
  • Ganymede is the largest natural satellite in our Solar System.  It is even larger than the planet Mercury (although it has less mass).
  • Ganymede is in orbital resonance with Io and Europa: for every orbit of Ganymede, Europa orbits twice and Io orbits four times.

You can view these links to learn more about Ganymede and the Galilean moons:
The Ganymede image on this page was taken in 1998 by the Galileo probe, and is courtesy of NASA/JPL/DLR.
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