Longest-running SETI project

SETI@home, developed by the University of California, USA, is a distributed computing project designed to find signs of extraterrestrial intelligence in radio signals gathered by the Arecibo radio telescope, Puerto Rico. Launched on 17 May 1999, it consists of a programme which can be downloaded to run on computers. In March 2003 SETI@home discovered a radio signal, known as SHGb02+14a, which does not correspond to any known galactic phenomena and is considered the most likely candidate for an alien civilisation.