The Kelly brothers have become key to figuring out how to prepare for and protect the human body during lengthy trips in space
Astronaut Scott Kelly will try something no American has ever done before, while his twin, retired astronaut Mark Kelly, spends the mission on Earth. As NASA looks towards an eventual three-year long round trip to Mars, the Kelly brothers have become key to figuring out how to prepare for and protect the human body during lengthy trips in space. Don Dahler reports.
