The density should be less than 2 g/cm3.Impact craters with little evidence of geological activity ought to dominate it.
Callisto is not differentiated from Ganymede. Callisto has a density of 1.8 grams per cubic centimeter, while Ganymede has a density of 1.9 grams per cubic centimeter.
The most active planet in the solar system is Jupiter's rocky moon Io, which has hundreds of volcanoes, some of which erupt in lava fountains dozens of miles (or kilometers) high.
Consequently, humans could live on Callisto's surface with only a sufficiently strong radiation-attenuating glass separating them from the planet's remaining radiation. This moon is about 40% water, providing it with a degree of radiation immunity.
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