Russian Cosmonauts Mikhail Korniyenko (left) and Gennady Padalka (right), members of the International Space Station 43/44 crew, seen during their work-outs on the ISS simulator at the Star City. Center: NASA Astronaut Scott Kelly.

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Scott Kelly, NASA Astronaut, member of the International Space Station 43/44 crew, seen during his work-outs on the ISS simulator at the Star City.

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Russian Cosmonaut Gennady Padalka, membes of the International Space Station 43/44 crew, seen during his work-outs on the ISS simulator at the Star City.

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Russian Cosmonaut Mikhail Korniyenko, member of the International Space Station 43/44 crew, seen during his work-outs on the ISS simulator at the Star City.

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NASA Astronaut Scott Kelly, member of the International Space Station 43/44 crew, seen during his work-outs on the ISS simulator at the Star City.

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NASA Astronaut Scott Kelly, member of the International Space Station 43/44 crew, seen during his work-outs on the ISS simulator at the Star City.

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Russian Cosmonaut Gennady Padalka (Roskosmos), member of the International Space Station 43/44 crew, seen taking photos during their work-outs on the ISS simulator at the Star City.

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Russian Cosmonauts Mikhail Korniyenko (left) and Gennady Padalka, members of the International Space Station 43/44 crew, seen during their work-outs on the ISS simulator at the Star City.

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Russian Cosmonaut Mikhail Korniyenko, member of the International Space Station 43/44 crew, seen during his work-outs on the ISS simulator at the Star City.

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Russian Cosmonaut Gennady Padalka, member of the International Space Station 43/44 crew, seen during their work-outs on the ISS simulator at the Star City.

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