The Arecibo Radio Telescope was a 305 m (1,000 ft) spherical reflector radio telescope built into a natural sinkhole at the ...
Insane Curiosity on MSN
Scientists sent Earth’s location into space without asking humanity
In 1974, humanity sent a powerful radio message from the Arecibo Observatory toward the star cluster M13, using a signal described as equivalent to a 20-trillion-watt transmitter. The message ...
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