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Mona Evans
Mona Evans • 2 years ago

Valhalla Crater on Callisto. Callisto is the most heavily cratered satellite in the Solar System. Its surface has apparently been primarily sculpted by impacts. Valhalla is its largest crater - it's 360 km (225 miles) across and the rings extend to 1900 km (1190 miles) from its center. (Photo: NASA) ©Mona Evans,"Jupiter's Galilean Moons" www.bellaonline.c...

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