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iss046e015788 | by NASA Johnson
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iss046e015788 (01/21/2016) --- NASA astronaut Scott Kelly (left) and Russian cosmonaut Mikhail Kornienko (right) marked their 300th consecutive day aboard the International Space Station on Jan. 21, 2016. The pair will spend a total of 340 days in space on their one-year mission as researchers hope to better understand how the human body reacts and adapts to long-duration spaceflight. This knowledge is critical as NASA looks toward human journeys deeper into the solar system, including to and from Mars, which could last 500 days or longer.

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Taken on January 21, 2016