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Gentlemen, your spacesuits await...

Sergei Remezov / Reuters

Spacesuits are seen laid out for U.S. astronaut Thomas Marshburn, Canadian astronaut Chris Hadfield and Russian cosmonaut Roman Romanenko before a test on a simulator of the International Space Station at the Russian cosmonaut training center at Star City outside Moscow on November 28, 2012. The three-man crew is scheduled to fly to the International Space Station in December.

Find out how a spacesuit works with NASA's interactive guide: The clickable spacesuit.

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