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Callisto and Mercury are very identical in size. Callisto's diameter is approximately 99 percent that of Mercury.
Scientists anticipate that there might be a 150-200 km deep ocean of salt water present under its surface.
Callisto is called “the most ideal spot for future human base” to study the Jovian worlds.
Callisto is 99 percent the size of Mercury, but it is barely even 30 percent of its mass.
Callisto’s surface is considered to be “the most highly cratered in the solar system”.
This majestic moon has been explored by a number of spacecraft, including the Pioneers 10 and 11, Galileo, Cassini, and Voyagers 1 and 2.
Only two moons—Ganymede and Titan—dominate Callisto in terms of size. It is the third largest moon in the solar system, to put it simply.
Callisto is tidally locked with Jupiter, meaning, the same side of Callisto always faces Jupiter.
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