Astronomy and Space Exploration
- April 19 - Aryabhata, India's first satellite, is launched using Soviet boosters.
- July 17 - Apollo-Soyuz Test Project: An American Apollo and a Soviet Soyuz spacecraft dock with each other in orbit marking the first such link-up between spacecraft from the two nations.
- August 20 - Viking program: NASA launches the Viking 1 planetary probe toward Mars.
Read more about this topic: 1975 In Science
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