NASA's Ultimate Space Twin Experiment Ready for Launch

Are identical twins still identical after one spends a year in space?

Published On 01/22/2015
11:50 AM EST
NASA astronaut Scott Kelly (left), Expedition 43/44 flight engineer and Expedition 45/46 commander; and Russian cosmonaut Mikhail Kornienko, Expedition 43-46 flight engineer, will launch for their year-long mission on board the International Space Station in March. | NASA