Aliens Answer Carl Sagan's Arecibo Message by Making Crop Circles (+Video)

On November 16, 1974, SETI researchers at the Arecibo radio telescope in Arecibo, Puerto Rico, beamed a message into space. They fired it toward Messier 13, a globular star cluster in the Hercules constellation, which rests 25,000 light years away.

The message, composed by Dr. Frank Drake, Carl Sagan, and other scientists, was conveyed using frequency modulated radio waves, converting it into a three minute binary transmission consisting of roughly 210 bytes. 
The signal was a million times stronger than the typical TV transmission.
According to Donald Campbell of Cornell University, who worked at the Arecibo Observatory as a research associate in 1974, “It was strictly a symbolic event, to show that we could do it.”

The Arecibo  “Answer”

on August 21, 2001 two crop circles popped up near the Chilbolton Observatory in Hampshire, UK.

One resembled a human face, but the other has since been dubbed the “Arecibo answer,” as it contains a format nearly identical to the original 1974 transmission, albeit with a few changes:

Read more here: http://www.strangerdimensions.com/2013/03/16/the-arecibo-message/

Arecibo message  https://en.wikipedia.org/wiki/Arecibo_message
 

The Two Most Important Alien Messages: Decoded
http://humansarefree.com/2011/02/two-most-important-alien-messages.html