Photo: Shuttle's Human Experiments Pave Way for Moon, Mars Voyages



The space shuttle Discovery safely touched down at the John F. Kennedy Space Center in Cape Canaveral, Florida, on July 17, 2006.

Science experiments started during the 13-day mission will help better prepare astronauts to stay healthy during long-distance space flights to the moon and Mars.

Photograph by John Raoux/AP Photo


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