Alexey Sitev
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An international crew of researchers - from left, Alexey Sitev of Russia, Romain Charles of France, Suhrob Kamolov of Russia, Alexander Smoleevskiy of Russia, Diego Urbina of Italy/Colombia and Wang Yue of China - gives a thumbs-up after a 520-day simulation of a flight to Mars, in Moscow on Tuesday. (Associated Press)
