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US astronaut Frank Culbertson exercises on a bicycle ergometer August... News PhotoAlpha Cell,Astronaut,Bicycle,Exercising,NASA,Pilot,Science and Technology,Space,Space Shuttle,Space Shuttle Discovery,Space Station,StationPhotographer Collection: Getty Images News 393203 02: (FILE PHOTO) US astronaut Frank Culbertson exercises on a bicycle ergometer August 10, 2001 on the mid deck of the Space Shuttle Discovery on his way to international space station Alpha. Culbertson took command of the international space station August 13, 2001 along with two Russian cosmonauts, where he will spend the next four months. (Photo by NASA/Getty Images)