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Apollo-Soyuz Test Project

United States-Soviet space program
Also known as: ASTP

Quick Summary

The Apollo-Soyuz Test Project was a joint space mission between the United States and the Soviet Union in July 1975. It marked a significant moment of détente during the Cold War, symbolizing improved relations between the two superpowers.12

The mission involved an Apollo spacecraft carrying three American astronauts docking in orbit with a Soviet Soyuz vehicle that had two cosmonauts aboard. This historic "handshake in space" allowed the crews to travel between the two spacecraft, exchange gifts, and conduct joint experiments. Although the mission itself was largely successful, a minor incident occurred during the American crew's reentry when poisonous nitrogen tetroxide entered their cabin, causing chemically induced pneumonia, from which they all recovered.132

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