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CAPE CANAVERAL, Fla. -- At NASA's Kennedy Space Center's Launch Pad 39-A, the school bus-sized Long Duration Exposure Facility LDEF containing 57 active and passive experiments from nine nations has been loaded into the payload bay of the space shuttle Challenger. The view from the Payload Change-out Room shows LDEF which will be deployed in orbit at an altitude of nearly 300 miles and retrieved after nearly a year so that the experimenters may analyze the effects of long term exposure to space on various substances and processes. The five-member STS-41C crew for this flight is headed by veteran astronaut Robert Crippen on his third space shuttle flight, and includes space rookies, pilot Dick Scobee and mission specialists Terry Hart, George Nelson and James van Hoften. Photo Credit: NASA