To date, the very popular SETI@home program has more than one million users and is installed on more than three million host computers. It has likely used more computer power than any other single software program in history—all in an effort to find extraterrestrial radio signals. Sadly, none of those computers has yet to find any evidence of alien transmissions.

A gold plaque was carried on both Pioneer 10 and Pioneer 11. The plaques were engraved with information about Earth and humans, just in case they ever encounter intelligent life as they journey through deep space.