Look: No Craters

NASA’s fly-by of Pluto, the most distant of the planets in our solar system, took place this week.

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An unexpected feature is very clear: there are no craters. So, does Pluto have active geological cycles of erosion and weathering, like those on Earth, which break down or cover over the surface marks from impacts?

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Mountains of ice (above left) are on the scale of Earth’s largest ranges. Above right is Pluto’s largest moon Charon, also free of craters.

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But earlier predictions of dog life on the planet appear to be unproven.

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Astronomers have recently voted to give back Pluto its status as a “planet”.