Sputnik Planitia

physical feature of Pluto

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In Pluto: The surface and interior
…half of Tombaugh Regio is Sputnik Planitia, a smooth plain of nitrogen ice without impact craters. The lack of craters shows that Sputnik Planitia is a very young feature and thus that Pluto likely has some geologic activity. Tombaugh Regio is surrounded by less smooth regions that contain some mountain…
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