The Apollo-Soyuz Test Project was a historic space mission conducted in July 1975, marking the first international human spaceflight. It involved a spacecraft from the United States, the Apollo, and a spacecraft from the Soviet Union, the Soyuz. The mission aimed to test the compatibility of the two different space systems and foster cooperation between the two superpowers during the Cold War. During the mission, astronauts from the Apollo spacecraft docked with the Soyuz spacecraft in orbit, allowing for crew exchanges and joint scientific experiments. This collaboration laid the groundwork for future international space missions and symbolized a thaw in U.S.-Soviet relations.