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Titan III(34)B|1975 in spaceflight Wikipedia
In 1975 several notable events happened in spaceflight such as the launch to Mars of the Viking orbiter/landers missions, the joint Apollo–Soyuz Test Project, and the Venera 9 Venus mission.Viking 1 was launched on 20 August 1975 and Viking 2 was launched 9 September 1975. This orbiter/lander mission was to photograph Mars in detail and to find water and life on the surface.
The Apollo-Soyuz saw an end to the space race with the USA and USSR. The mission was launched between 15 July 1975 and 17 July 1975.
The Venera 9 mission was launched 8 June 1975 was another successful orbiter/lander mission.