Physics, 15.04.2020 00:47 imantahir1200345
The Arecibo Observatory sent a powerful radio signal to space in 1974. Assume there is an alien civilization located on a planet around Alpha Centauri (distance 4.2 light-years from Earth) and they detect this transmission. They immediately send an invasion force that travels at 10% of the speed of light. What year ON EARTH will the alien invasion force arrive
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The Arecibo Observatory sent a powerful radio signal to space in 1974. Assume there is an alien civi...
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