Dwayne Brown, NASA public affairs officer, opens a briefing on NASA's New Horizons mission to Pluto, Tuesday, April 14, 2015 at NASA Headquarters in Washington, DC. ames Green, director of Planetary Science, NASA Headquarters, Washington; Glen Fountain, New Horizons project manager, Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland; Alan Stern, New Horizons principal investigator, Southwest Research Institute, Boulder, Colorado; and Hal Weaver, New Horizons project scientist, Johns Hopkins University Applied Physics Laboratory, Laurel, Maryland; discussed some of the chall

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