ArgoChasma
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Pluto's moon Charon features a massive, deep chasm
While humans are still a long way away from going canyoneering on the moons of Pluto, we can at least start scoping out the terrain. In images shot last summer by NASA's New Horizons spacecraft, we can see one immense and interesting feature of Charon: a deep canyon dubbed the Argo Chasma that slices through one hemisphere of Pluto's largest satellite.