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mars is our goal

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there are so many scientific questions

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we want to answer there we might even

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find the first evidence of life beyond

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earth

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we've already proven we can send a rover

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to mars

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but now we need to learn how to send

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people

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a human mission to mars and back could

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take two and a half years

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and we don't know for sure how people

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will hold up in weightlessness for that

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long we need the people we send to mars

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to be healthy enough to do work once

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they get there

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and that's why the one year mission of

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scott kelly and michal kornyenko on the

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international space station was so

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important

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we started testing scott and misha a

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year before they launched and kept

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taking samples from them throughout on

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orbit to see how they reacted over time

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to being in weightlessness doctors check

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them out at the landing site right out

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of their soyuz spaceship and they'll

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undergo additional tests for many more

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months on the ground

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then we've got to dig through all that

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data gathered to learn more we're

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studying information about bone loss and

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muscle weakness and affects their fine

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motor skills we're studying the

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psychological effects of an extended

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space flight and how well they slept

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we're looking to see if there was an

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impact to their vision we're looking at

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everything to make sure the people we

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send to mars will make the trip safely

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on top of measuring the impacts of

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weightlessness to the human crew we're

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using these international space station

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missions to learn about the hardware and

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technology we need for the trip

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things like how to refine our life

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support systems to make them more

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reliable how to use robots to help

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humans do their work we're even figuring

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out how to communicate effectively over

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these huge distances and how to make the

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human crew members more self-sufficient

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the international space station is our

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test bed to work out the details of how

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to send people to these deep space

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destinations and bring them home safely

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in the process we're also promoting

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international cooperation

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and enabling commercial participation in

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space flight research all while we