NASA's Pluto Zoom-in Reveals Flat Plain Likely Still Forming

NASA on Friday posted this zoom-in image of what has been informally named “Tombaugh Regio,” in honor of astronomer Clyde Tombaugh, who discovered the dwarf planet. Tombaugh Regio (Latin for “region”) is a cratered plain possibly still being formed by geologic activity, NASA said. Credit: Facebook/NASA