Kelly and Kornienko’s Year-Long Mission Paves Way for Journey to Mars

With 520 cumulative days in space, and 340 days from his (almost) one-year mission aboard the International Space Station (ISS), Scott Kelly is now the national record-holder for the longest single space mission and the greatest amount of spaceflight time of any U.S. citizen. Photo Credit: NASA

For the first time in almost five [...]