The Soviet/Russian space program was developed in the 1930s and conducted manned and unmanned space missions until the dissolution of the USSR in 1991. Key figures who advanced space science and technology in the Soviet Union included Konstantin Tsiolkovsky, Sergei Korolev, and others. Major events and accomplishments included the launch of Sputnik 1 in 1957, Vostok missions that carried the first human (Yuri Gagarin) into space in 1961, and Luna missions that achieved the first unmanned lunar impacts and photography. The Soviet Union achieved several "firsts" in space exploration during the Cold War space race but also experienced some unsuccessful missions, and challenges included lack of long-term strategic planning and funding