The second Soviet human spaceflight lasted a entire day to test the effects of space conditions on the human body. It was the first day-long human spaceflight in history, and the first time the complexities of an orbit and its position over Earth's surface played a role in mission duration, as the day-long flight would bring the spacecraft down roughly back to where it started. Vostok 2 proved that humans could survive with no harmful effects for 24 hours in space. At 26 years old, Titov remains to this day the youngest person to ever travel to space.