NASAのインスタグラム(nasa) - 7月18日 02時55分

Zoom in! New from our New Horizons spacecraft: In the center left of Pluto's vast heart-shaped feature - informally named "Tombaugh Regio" - lies a vast, craterless plain that appears to be no more than 100 million years old, and is possibly still being shaped by geologic processes. This frozen region is north of Pluto's icy mountains and has been informally named Sputnik Planum (Sputnik Plain), after Earth's first artificial satellite.

Credit: NASA/JHUAPL/SwRI

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