A tale of two astronauts: Scott and Mark Kelly participate in NASA Twins Study

Tuesday, March 1, 2016 - 23:50 in Astronomy & Space

After nearly a year on the International Space Station, NASA astronaut Scott Kelly returns to Earth on Tuesday night, completing, along with Russian cosmonaut Mikhail Kornienko, the longest continuous stay in space. Kelly, Kornienko and his fellow cosmonaut Sergey Volkov undocked from the space...

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