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This image made available by NASA on July 24, 2015 shows a combination of images captured by the New Horizons spacecraft with enhanced colors to show differences in the composition and texture of Pluto's surface. The deep icy basin in Pluto's heart-shaped region may be a natural sinkhole. In a study published Wednesday, Nov. 30, 2016, a team led by University of Maryland astronomer Douglas Hamilton suggests the basin may have resulted from the weight of surface ice. (NASA/JHUAPL/SwRI via AP) **FILE**

This image made available by NASA on July 24, 2015 shows a combination of images captured by the New Horizons spacecraft with enhanced colors to show differences in the composition and texture of Pluto's surface. The deep icy basin in Pluto's heart-shaped region may be a natural sinkhole. In a study published Wednesday, Nov. 30, 2016, a team led by University of Maryland astronomer Douglas Hamilton suggests the basin may have resulted from the weight of surface ice. (NASA/JHUAPL/SwRI via AP) **FILE**

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