Soyuz 40The final first-generation Soyuz spacecraft, Soyuz 40, is launched on a week-long spaceflight by the Soviet Union. With Leonid Popov and Romanian cosmonaut Dumitru Prunariu aboard, Soyuz 40 visits space station Salyut 6 for several days, and is the last spacecraft to dock at the five-year-old space station. The Soyuz 40 crew returns to Earth on May 22nd. Future Soyuz launches will use the upgraded Soyuz-T vehicles.