From Wiki 5A
This is the
moon Callisto
is one of
Jupiter's moons. It's the darkest of the four moons of Jupiter. The temperature reaches 125°C. It's surface is covered with scars. It's much less dense than Earth's moon. Callisto's interior is probably
ice. Ice-rock crust covers water and ice mantle. Callisto has many
craters, but they are flat. Glacier-like flow of ice from below fills in the craters. The dust from the impact has left ice crust "dirty."
