On July 17, 1975, a historic moment occurred in space when Thomas Stafford of the United States shook hands with Alexei Leonov of the Soviet Union aboard the Apollo-Soyuz spacecraft. This handshake symbolized a significant turning point in space exploration, marking the first time that spacecraft from two different nations docked in orbit.
The Apollo spacecraft, carrying a crew of three—including Donald K. “Deke” Slayton and Vance D. Brand—met the Soyuz spacecraft with its two cosmonauts, culminating five years of planning for this joint mission. Prior to this mission, the U.S. and Soviet Union had been in a competitive space race, notable for achievements such as the first human in space and the first spacewalk by the Soviet Union, yet the U.S. ultimately claimed victory with the Moon landing in 1969.
This mission not only represented a technological collaboration but also signified a thawing of Cold War tensions, paving the way for future international cooperation in space exploration.
For more about the Apollo-Soyuz mission, you can check out this video.