Prior to re-entry (following a record-setting stay aboard the Soviet Union's Salyut 1 space station), the crew capsule of the Soyuz 11 spacecraft depressurizes, killing the three cosmonauts on board. Georgy Dobrovolsky, Vladislav Volkov and Viktor Patsayev are the first humans to die in space.

The Soviet Union, officially the Union of Soviet Socialist Republics (USSR), was a transcontinental country that spanned much of Eurasia from 1922 until its dissolution in 1991. It was the world's third-most populous country, the largest by area, and bordered twelve countries. A diverse multinational state, it was organized as a federal union of national republics, with the largest and most populous being the Russian Soviet Federative Socialist Republic (SFSR). In practice, its government and economy were highly centralized. As a one-party state governed by the Communist Party, it was the flagship communist state. Its capital and largest city was Moscow.