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Wed, 06 May 2026 11:36:33 +0000

In Depth Jupiters moon Ganymede is proving to be a fascinating world. Not only is it the largest moon in our solar system, bigger than the planet Mercury and the dwarf planet Pluto, but NASAs Hubble. Formation Jupiters large Galilean moons Io, Europa, Ganymede, and Callisto likely formed out of leftover material after Jupiter condensed from the initial cloud of gas and dust surrounding the sun,. NASAs real-time science encyclopedia of deep space exploration. Our scientists and far-ranging robots explore the wild frontiers of our solar system. Callisto is Jupiters second largest moon and the third largest moon in our solar system. Its about the same size as Mercury. In the past, some scientists thought of Callisto as a boring ugly duckling.