Workers prepare the first fairing section in the background that will encapsulate the New Horizons spacecraft at left for flight.

In the Payload Hazardous Servicing Facility, clean-suit garbed workers prepare the first fairing section (in the background) that will encapsulate the New Horizons spacecraft at left for flight. The fairing protects the spacecraft during launch and flight through the atmosphere. Once out of the atmosphere, the fairing is jettisoned. The compact 1,060-pound New Horizons probe carries seven scientific instruments that will characterize the global geology and geomorphology of Pluto and its moon Charon, map their surface compositions and temperatures, and examine Pluto's complex atmosphere. After that, flybys of Kuiper Belt objects from even farther in the solar system may be undertaken in an extended mission. New Horizons is the first mission in NASA's New Frontiers program of medium-class planetary missions. The spacecraft, designed for NASA by the Johns Hopkins University Applied Physics Laboratory in Laurel, Md., will fly by Pluto and Charon as early as summer 2015.