Stock Photo - NASA astronauts Michael Barratt (left), Alvin Drew, Nicole Stott and Tim Kopra, all STS-133 mission specialists, participate in a training session in an International Space Station mock-uptrainer in the Space Vehicle Mock-up Facility at NASA's Johnson Space Center.

Stock Photo: NASA astronauts Michael Barratt (left), Alvin Drew, Nicole Stott and Tim Kopra, all STS-133 mission specialists, participate in a training session in an.

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