The Mercury program was the United States's first successful manned spaceflight program, from 1959 through 1963 with the goal of putting a man in orbit around the Earth. The program was officially carried out by the newly created NASA.
Mercury spacecraft were very small one-man craft; it was said that the Mercury spacecraft were not ridden, they were worn. The spacecraft had only attitude and reentry thrusters. They could not effect any orbital changes apart from the reentry burn. The spacecraft were designed to be totally controllable from the ground in the event that the space environment impaired the pilot's ability to function. See Large Image
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