putnik is the Soviet word for trav­eling companion, and Sputnik 1 was the first space traveler from Earth. The world’s first artificial satellite, it was launched by the Soviet Union on October 4, 1957.

International Geophysical Year

After World War II brought advances in rocket technology, interest in launching artificial satellites grew, in both the United States and the Soviet Union. The world’s science organizations designated 1957 to 1958 as International Geo­physical Year. Committees were formed to observe such phenomena as cosmic rays, gravity, and solar activity. It was hoped that the period also would see the launch of the first satellite.

The United States prepared two satel­lites, Explorer and the smaller Vanguard. No one was entirely sure that a satellite launch would work. For that reason, Vanguard was a tiny spacecraft, designed to test the theory that it was
possible to launch a satellite on top of a multistage rocket. Unlike the Soviets, the Americans had relatively small launch rockets. Also unlike the Soviets, they released details of their space program to the public.

Very little information had been released about Soviet space plans, although some details of space radio links had been made public, suggesting that the Soviets had a satellite program. This was the era of the Cold War, when the United States and the Soviet Union were building up their supplies of large rockets for military use as well as for scientific study. Rockets used as ballistic missiles could potentially deliver nuclear weapons over ranges of thousands of miles. Both sides kept their military developments secret, and the Soviet Union extended this secrecy to its devel­opment of space technology.




The satellite Sputnik 1 was fairly sim­ple. It was an aluminum sphere pres­surized by nitrogen gas. Inside the sphere were batteries providing elec­trical power for two radio transmit­ters. Attached to the outside of the sphere were four whip-like radio antennae.

Launch date: October 4, 1957.

Size: 23 inches (58 centimeters) in diameter.

Weight: 183 pounds (83 kilgrams). Speed: About 18,000 miles per hour (28,960 kilometers per hour).

Orbital height: 143-584 miles (230-940 kilometers).

Orbital time: 96 minutes.

Подпись: о An "exploded" view of Sputnik 1 shows that the world's first satellite was a simple device. 4_________________________ У

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