Astronauts Scott and Mark Kelly will take part in an unprecedented study of identical twins to better understand the effects of prolonged weightlessness by comparing the twin in space with the twin on the ground.
When Scott Kelly embarks on a one-year space station stint next spring, his twin brother and retired astronaut Mark Kelly will be joining in from Earth, undergoing medical testing before, during and after his brother's American-record-setting flight.
18:00 Yoga In Space Could Be Must For Astronauts14
17:55 Images Indicate European Mars Lander Destroyed: Space Agency12
17:10 Gene study clears 'Patient Zero' as cause of U.S. HIV epidemic15
18:00 Life In Space Twists and Turns Muscles, Gives Severe Back Pain, New Study On Astronauts Reveals12