Apollo and Soyuz capsules linked up 140 miles above the Earth, marking the first joint US-Soviet space mission and a symbolic thaw in the Cold War space race. Nations that had competed fiercely since Sputnik now shared oxygen, meals, and a docking module engineered as a diplomatic compromise.
For a decade the two superpowers had raced each other to the Moon in a contest of ideology as much as engineering. By 1975 both space programs needed something new, and détente offered it: a joint mission requiring an entirely new docking adapter since American and Soviet hardware couldn't otherwise connect.
When the hatch opened, Tom Stafford greeted Alexei Leonov in halting Russian, and Leonov replied in English coached phonetically by his American counterparts. They exchanged flags, seeds, and commemorative medallions, then shared a meal of borscht squeezed from tubes labeled, as a joke, with vodka labels.
The mission lasted just two days of joint operations before the craft separated, but it set the template for later cooperation, eventually leading to Shuttle-Mir dockings and the International Space Station. Stafford and Leonov remained close friends for the rest of their lives, a durable friendship built from a fragile political moment.
Key people: Thomas Stafford, Alexei Leonov, Deke Slayton