article_snippet: his record-breaking trip will test how the human body copes with prolonged space travel by comparing Kelly's health to that of Kelly's health identical twin brother, retired astronaut Mark Kelly, who will remain on Earth.
article_snippet: Called the Nasa Twin Study, the Kellys will be subjected to 10 experiments in four areas: human physiology, behavioral health, microbiology and molecular. '
article_snippet: Giant leaps: Scott Kelly, pictured right, will undergo tests to compare his health to that of his identical twin brother, Mark Kelly, left, his a retired astronaut, to see how being in space affects the body .
article_snippet: Mark Kelly, pictured left as his joked around with his after a news conference in the Baikonur cosmodrome, Kazakhstan on Thursday, said his would not be eating the same diet  as his twin . '
article_snippet: In this case we've got two genetically identical individuals and we can monitor what kind of changes occur in Mark in an ordinary lifestyle and compare those to the changes that we see in Scott.'
article_snippet: The two will conduct many of the same medical experiments over the coming year so scientists can compare the results.
highlights_snippet: Scott Kelly will undergo tests to compare Scott Kelly health to that of Scott Kelly twin brother, retired astronaut Mark Kelly, to see the effects of space on the body .
  