sputnik
sputnikSputnik, name of the first of several artificial satellites launched by the Soviet Union from 1957 to 1961. The goals of the Sputnik program included studying the earth’s upper atmosphere, observing animal survival in space flight, and testing Soviet rocket technology. The launch of the unmanned Sputnik 1 and of Sputnik 2, which carried a dog, spurred the United States to invest more money and resources into its fledgling space program, initiating a race between the two nations to land a person on the moon (see Space Exploration).
The Sputnik program began on October 4, 1957, with the launch of Sputnik 1, which weighed 83 kg (184 lb). The official name of the satellite was Iskustvennyi Sputnik Zemli (fellow world traveler of the earth). The launch vehicle was a test version of the Soviet intercontinental ballistic missile (see Guided Missiles). Sputnik 2 was launched on November 3, 1957, and weighed 508 kg (1100 lb). It carried a female dog named Laika. On-board instruments showed that Laika survived in space for several days until her oxygen supply was exhausted.
After failing in its first attempt, the United States launched its own satellite, Explorer 1, on January 31, 1958. The satellite weighed only 14 kg (31 lb), including its rocket motor. The Soviets responded by launching Sputnik 3, which weighed 1.3 metric tons, on May 15, 1958.
The first three Sputnik satellites each carried instruments to measure the temperature and density of the earth’s upper atmosphere, the electron density of the ionosphere, and the size and number of micrometeorites (tiny particles in space). In addition, Sputnik 3 carried the first space laboratory, a wide array of instruments that could...
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