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.

Over the past half century, astronomers around the world have been constantly scanning the universe through massive radio telescopes systems to search for signals of a civilization other than Earth.

Google celebrates the day of sending Arecibo Message.

44 years ago, on November 16, 1974, Frank Drake, Carl Sagan and several other scientists sent a three-minute message from the Arecibo observatory in Puerto Rico.

The Arecibo message is a binary code of 1,679 bits - the product of two prime numbers 23 and 73. Scientists hope a civilization somewhere beyond Earth, in another Solar System, will Obtain and know human existence.

The message contains information transmitted in encrypted form such as numbers from 1 to 10, atomic numbers, formulas for sugar and zeros, Solar system images, images of Arecibo radio telescopes, Graphic figure of a human, the height of an average man and the population on Earth.

Arecibo radio signal is the first message that humanity actively sends out to space.

Currently, there are many ideas that should not send messages to. Including the famous theoretical physicist said that because we do not know how extraterrestrial intelligence is, how good and bad it is, that sending them a potential message is very risky. If aliens are hospitable creatures, that doesn't matter. But if they are aggressive, sending them a message is like shouting "Attack us".