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STAR CITY, RUSSIA - MARCH 5: In this handout from National Aeronautics and Space Administration or NASA, Astronaut Scott Kelly is seen inside a Soyuz simulator at the Gagarin Cosmonaut Training Center (GCTC) March 5, 2015 in Star City, Russia.
STAR CITY, RUSSIA - MARCH 5: In this handout from National Aeronautics and Space Administration or NASA, Astronaut Scott Kelly is seen inside a Soyuz simulator at the Gagarin Cosmonaut Training Center (GCTC) March 5, 2015 in Star City, Russia.

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Astronaut Scott Kelly: We're ready for Mars

Retired NASA astronaut Scott Kelly chats with CNN Correspondent Rachel Crane about the possibility of people exploring Mars.

Astronaut Scott Kelly: We're ready for Mars

Retired NASA astronaut Scott Kelly chats with CNN Correspondent Rachel Crane about the possibility of people exploring Mars.