SPUTNIK / SCIENCE PHOTO LIBRARY SPUTNIK / SCIENCE PHOTO LIBRARY
Soviet Sputnik 4 stamp commemorating the launch of the Soviet spacecraft Sputnik 4 on 15 May 1960. Sputnik 4 was a test-flight of the Vostok spacecraft, which launched the following year, taking Yuri Gagarin into orbit. Sputnik 4 contained a dummy to simulate the presence of a person. The spacecraft remained in orbit until 5 September 1962, when it re-entered the Earth's atmosphere where most of it burnt up. The letters CCCP at the bottom, and the country shown in red on the globe, both refer to the USSR.
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