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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.
First Letter
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Articles about First Letter
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Typical types of writing in human history
According to archaeologists, ancient texts appeared earliest in major civilizations such as Mesopotamia, Egypt, India, and China.
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Auction the first letter about DNA
One of the scientists found the DNA structure that wrote to his son to explain his discovery 60 years ago. The letter is about to be auctioned at a starting price of aro…