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This Nov. 4, 2011, photo released by Moscow's Institute for Medical and Biological Problems Russia, shows researcher Sukhrob Kamolov leaving a set of windowless modules after a grueling 520-day simulation of a flight to Mars. (Associated Press/IMBP, Oleg Voloshin) **FILE**
Photo by: Oleg Voloshin
This Nov. 4, 2011, photo released by Moscow's Institute for Medical and Biological Problems Russia, shows researcher Sukhrob Kamolov leaving a set of windowless modules after a grueling 520-day simulation of a flight to Mars. (Associated Press/IMBP, Oleg Voloshin) **FILE**

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