1 of the 4 biggest Jupiter moons still missing(like in 1.7)? Io is closest, followed by Europa, Ganymede, and Callisto. @Awesome and astronomy friendshttp://www.cosmiclight.com/imagegalleries/jupiter-moons.htm OP can you add biggest Jupiter moon Ganymede? Ganymede is maybe most beautiful moon Ofc when u have a time...later [thumb]