Scientists study 100 possible alien radio signals from collapsed Arecibo Observatory, ending groundbreaking 21-year search | Live Science

A crowd-sourced search for alien intelligence called SETI@Home is in its final stages, analyzing 100 radio signals of interest using the world's largest radio telescope. The project, which enlisted millions of volunteers, has identified over 12 billion signals in 21 years of data. The top 100 candidate signals are now being studied in detail with China's Five-hundred-meter Aperture Spherical Telescope (FAST). Despite no evidence of alien transmissions, the team is enthusiastic that their dataset will improve future searches for extraterrestrial intelligence.