Sixty years ago, on Oct. 4, 1957, the first artificial Earth satellite was put into orbit.
Launched from the Soviet space complex in Baikonur, Sputnik 1 completed
a total of 1,440 revolutions around the Earth. This metal sphere,
about 58 centimeters in diameter, outfitted with four antennas came be a symbol
of the Space Age — the era of intense space exploration.