world biggest alien – Astronomers are closing the final stages of one of the world’s biggest searches for extraterrestrial intelligence, as just 100 mysterious radio signals remain under investigation. These are signals that were identified years ago by the global SETI@home project and are now being re-examined using China’s powerful FAST radio telescope. But scientists warn that most, if not all, are likely man-made interference.

Nevertheless, each is being examined very closely because scientists believe that any possibility, even chance, of discovering alien technologies is worth it. From billions of blips to 100 signals: How SETI scientists narrowed the search According to SETI researchers, SETI@home ran from 1999 to 2020 and used millions of computers around the world to process Arecibo’s observations, identifying nearly 12 billion candidate signals. Over time, advanced algorithms and manual inspection have reduced this to 100 signals, which are now worthy of careful follow-up.

FAST has been capturing these signals since July 2025. Since Arecibo fell in 2020, FAST is the only facility that can make these types of observations.

Even if no signals are extraterrestrial, SETI scientists say the project sets a new sensitivity standard for future searches. FAST Telescope Takes Charge: Tracking SETI Signals and Setting New Standards in Alien Search This effort highlights the power of citizen science and careful data analysis. The researchers also noted that modern computing and machine learning would allow all SETI@home data to be reviewed in the future in case a signal is missed.

SETI co-founders say the project has exceeded expectations, showing that global collaboration can advance the search for life beyond Earth.