NASA Astronaut Scott Kelly takes a break from reviewing his training materials at his quarters on the grounds of the Gagarin Cosmonaut Training Center, Wednesday, March 4, 2015 in Star City, Russia. Kelly and Russian Cosmonauts Mikhail Kornienko and Gennady Padalka of the Russian Federal Space Agency were preparing for their March 28, 2015 launch as part of the Expedition 43 mission to the International Space Station. Kelly and Kornienko are returning to Earth on Soyuz TMA-18M on Tuesday after nearly a year in space.