FIRST ARTIFICIAL EARTH SATELLITE Crossword Clue

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Crossword Puzzle Infos
The first artificial Earth satellite was the Soviet Union's SPUTNIK, which was launched in 1957. It was the first man-made object to be placed into orbit around the Earth and marked the beginning of the Space Age. SPUTNIK was a metal sphere about the size of a beach ball, with four external radio antennas to broadcast radio pulses. Its mission was to measure the density of the upper atmosphere.
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