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The History of the Corona and the Agena Spacecraft
LMSC's Corona system was the first spacecraft in history to do all of the following things: achieve a circular orbit, achieve a polar orbit and be stabilized on all three axes. They returned 39,000 man-made objects from space; they took 2.1 million feet of film of photographs in 39,000 cans. The strategy of the program evolution over time followed the four stages that we know of - see it, get photos, see it well or see it now.