Members of the New Horizons science team react to seeing the spacecraft's last and sharpest image of Pluto before closest approach later in the day, Tuesday, July 14, 2015 at the Johns Hopkins University Applied Physics Laboratory (APL) in Laurel, Maryland. NASA's New Horizons spacecraft was on track to zoom within 7,800 miles (12,500 kilometers) of Pluto on Tuesday. (Bill Ingalls/NASA via AP)
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