UC Berkeley researchers develop new technique in search for extraterrestrial life

BERKELEY – The truth is out there—and researchers at University of California, Berkeley are determined to find it with a new method announced in a scientific journal Tuesday for finding possible extraterrestrial life through radio signals from space.

Scientists have long searched for life on other planets through radio signals, but interference from terrestrial radios, cellphones, microwaves and other technologies often lead to false alarms. The new technique, developed by scientists at UC Berkeley's Breakthrough Listen project, verifies that the radio signal they are tracking has actually passed through space, making it easier to filter out false positives.

The new detection method was described in an article that appeared in The Astrophysical Journal written by UC Berkeley graduate student Bryan Brzycki, UC Berkeley professor emeritus of astronomy Imke de Pater and Andrew Siemion, the director of UC Berkeley's program to search for extraterrestrial life.

According to a UC Berkeley press release, radio signals by broadcast technology create a narrowband radio signal, which is distinguished from the broad range of radio signals created by cosmic sources, like stars or supernovas. Because of terrestrial radio interference, determining what signals came from space can be like looking for a needle in a haystack.

This technique will be useful for signals that have originated more than 10,000 light years from Earth, researchers say. The new technique will be employed in future searches for alien life at the Green Bank Telescope in West Virginia—the largest steerable radio telescope in the world—and the MeerKAT radio telescope in South Africa.

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