Sergei Krikalev
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"Sergei Konstantinovich Krikalev" is a Russian cosmonaut and mechanical engineer. As a prominent rocket scientist, he is a veteran of six space flights and has spent more time in space than any other human: a total of 803 days, 9 hours, and 39 minutes. He retired from spaceflight in 2007 and is currently working as vice president of S.P. Korolev Rocket and Space Corporation Energia/Space Corporation Energia.

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