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Mona Evans
Mona Evans • 1 year ago

Europa. It's covered in ice and is one of the smoothest objects in the Solar System. The small number of craters shows that the surface is young, possibly only a 100 million years old. (That's young geologically.) In this picture you can see that there are also cracks and streaks. The cracking is caused by tidal heating, but we don't know exactly what the staining is. ©Mona Evans,"Jupiter's Galilean Moons" www.bellaonline.c...