SETI is the Search for ExtraTerrestrial Intelligence.
The mission of the SETI Institute is to explore, understand and explain the origin, nature and prevalence of life in the universe.
The SETI Institute is a private, nonprofit organization dedicated to scientific research, education and public outreach.
Columbus Optical SETI Observatory
SETI Disrupted By Cell Phones in Airplanes?
If you want to take part in SETI yourself, check out Seti@home!
Related: Seti@home