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KENNEDY SPACE CENTER, FLA. - After six years of silence, the thunder of manned space flight is heard again, as the successful launch of the first Space Shuttle ushers in a new concept in utilization of space. The April 12 launch at Pad 39A, just seconds past 7 a.m., carries astronauts John Young and Robert Crippen into an Earth orbital mission scheduled to last 54 hours, ending with unpowered landing at Edwards Air Force Base in California. STS-1, the first in a series of Shuttle Vehicles planned for the Space Transportation System, utilizes reusable launch and return components.