SETI, short for Search for ExtraTerrestrial Intelligence, was a program tasked with trying to find proof of life beyond the planet Earth. The people in charge of the program sent many different messages into outer space in 1974 from Arecibo Observatory, including information on human DNA, a map of the solar system and population of the Earth to any that might be listening beyond the stars.
Then, the impossible happened: In 1993, they received a response from an unknown source not of this world. The response was two distinct messages. The initial message was how to create a new energy source using methane, and the secondary message was a new sequence of alien DNA with instructions on how to combine it with human DNA.