The New Horizons team located more than 1,000 craters on this map of Pluto. Scientists count the number of impact craters to determine the age of a surface.

Older regions generally have more impact craters. Pluto’s oldest regions are about 4 billion years old. Its youngest areas may have formed within the past 10 million years.

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NASA-PIA20154

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NASA/Johns Hopkins University Applied Physics Laboratory/Southwest Research Institute

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