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Jupiter's Moon Callisto Probably Has an Ocean Under Its Surface
If there was a contest for the most interesting moon in our solar system, Callisto would be a contender. Jupiter's second-largest moon has more impact craters on its surface than any other ...
Top 7 largest moons in solar system captured by NASA
Ganymede, Jupiter's largest moon and the solar system's largest, is bigger than Mercury and the dwarf planet Pluto, with a diameter of 5,268 kilometers.