On January 16, 1969, two crewed spacecraft docked in orbit for the first time. [‘On This Day in Space’ Video Series on Space.com](https://www.space.com/39251-on-this-day-in-space.html)

When the Soviet Union launched the Soyuz 4 spacecraft, only one cosmonaut was on board. But it returned with a crew of three after two cosmonauts from Soyuz 5 transferred spacecrafts in orbit. Soyuz 4 safely returned to Earth, but the one unlucky cosmonaut who was left behind in Soyuz 5 had a pretty rough landing. During reentry, the service module failed to separate from the descent module, and the spacecraft got turned upside-down. To top it off, the parachutes and soft-landing rockets failed. That cosmonaut, Boris Volynov, miraculously survived the crash — but he did lose a few teeth.