Soyuz 9 was a Soviet space mission launched on June 1, 1970. It was notable for its long-duration flight, lasting 18 days, 17 hours, and 5 minutes. The mission aimed to study the effects of extended space travel on the human body and to test life support systems. The crew consisted of cosmonauts Andriyan Nikolayev and Vitaly Sevastyanov. During the mission, they conducted scientific experiments and performed manual docking maneuvers. Soyuz 9 successfully returned to Earth on June 19, 1970, marking a significant achievement in human spaceflight and contributing to future long-duration missions.