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The Arecibo message is the first 'letter' sent to the aliens
Arecibo radio signal is the first message that humanity actively sends out to space. It is a binary code of 1,679 bits - the product of two primes 23 and 73.
Arecibo Message
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Articles about Arecibo Message
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Space science
Find radio waves to detect aliens
US scientists say they are not looking for messages from aliens and how to decode them, but only focus on finding radio transmitters that suggest that aliens exist.