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A look back on the years's launches, space explorations and discoveries.
21 of 31
Astronaut candidate Christina M. Hammock successfully makes fire during wilderness training in Portland, Maine, August 28, 2013. As the first phase of their extensive training program along the way to become full-fledged astronauts, eight new ASCAN 2013 candidates spent three days in the wild participating in their wilderness survival training, near Rangeley, Maine. UPI/ L. Harnett/ NASA
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