Astronomers revive SETI@home's hunt for overlooked alien signals from decades of data

The SETI@home project, which ran from 1999, used volunteers' home computers to scan for extraterrestrial signals. Over two decades, it analysed more than 12 billion unusual radio signals from the Arecibo Observatory. Now, astronomers are revisiting its data for overlooked clues.

SETI@home relied on 'commensal' data, meaning it processed observations collected for other purposes. This approach limited its ability to focus on specific sky regions for extended periods. Despite this, the project set a new benchmark for sensitivity in detecting potential alien transmissions.

After initial filtering and manual checks, 100 signals were flagged as possible technosignatures. However, none has been confirmed as a definitive alien message or a new 'Wow! signal'. Early algorithms may have missed some candidates that met the criteria, leaving room for further investigation.

Astronomers are now using China's FAST radio telescope to study the origins of these 100 signals. The team has not disclosed how many have been re-examined or which star systems are being prioritised. The search continues, with hopes that future projects will refine detection methods.

The legacy of SETI@home endures, with its vast dataset still holding potential discoveries. The ongoing use of FAST highlights the persistent interest in finding alien technosignatures. While no definitive proof has emerged, the project's methods and findings remain valuable for future research.