Which of these historical event took place in 1957?

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On October 4, 1957, the Soviet Union launched the satellite Sputnik 1. Sputnik transmitted a radio signal to Earth for 21 straight days before the batteries powering it ran out.
dpa/picture alliance via Getty Images
dpa/picture alliance via Getty Images
Which of these historical event took place in 1957?
- Man landed on the Moon
- A Space Shuttle crash
- The first launch of the Apollo space program
- Sputnik 1 was launched
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