Astronauts Return To Earth After Year In Space

US astronaut Scott Kelly will return from the International Space Station after becoming the first American to spend virtually a whole year continuously in space. The 52-year-old began collaborative investigations on the space station with Russian Mikhail Kornienko into how the human body adjusts to weightlessness, isolation, radiation and the stress of long duration space flight in March 2015 . NASA considers the mission crucial for future Mars explorers who will have to spend much longer in sp