Nasa'S New Horizons

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A child leaves Lowell Observatory in Flagstaff, Arizona, on Friday, July 10, 2015. The Lowell Observatory where Pluto was discovered is celebrating the flyby of the dwarf planet by NASA's New Horizons spacecraft. The celebration is 9 years in the making. New Horizons left from Cape Canaveral, Florida, in 2006, the same year Pluto was demoted from a planet to a dwarf planet, and embarked on a 3 billion-mile journey. It will come within 7,767 miles of Pluto in the pre-dawn hours Tuesday traveling at 31,000 mph. The spacecraft’s confirmation signal won’t reach earth until Tuesday night. (AP Photo/Felicia Fonseca)