Search for Extra Terrestrial Intelligence
Search for Extra Terrestrial Intelligence (SETI) was a 20th century Earth effort to explore, understand and explain the origin, nature and prevalence of extraterrestrial life – most notably alien intelligence – in the universe. 

The SETI greeting was displayed on a plaque on the hull of such NASA probes as Voyager 6 and Pioneer 10. (; )

In 1996, a young researcher, Rain Robinson, detected the  and transmitted the standard SETI greeting. ()

See also
Carl Sagan

External links

SETI Institute

de:SETI
Earth
Research organizations‎