After 340 days, more than 5,000 trips around the Earth, and nearly 200 gallons of drinking water made from recycled sweat and urine, U.S. astronaut Scott Kelly and Russian cosmonaut Mikhail Korniyenko returned to Earth on Tuesday, completing their spectacular Year In Space. The longest outer space journey in history, Kelly will forever be remembered for his research, bravery, and the amazing images he captured of planet earth. Check out 15 of those photographs right here and head to Nat Geo to learn more about the pics from NASA and Scott Kelly.