The search for alien life has always been hampered by the huge racket that Earth generates, rendering it difficult to tease out alien signals from all the local noise.
But a new method for recognizing radio signals traveling through interstellar space could narrow the search considerably.astrophysicist Andrew Siemion, a co-author of a paper describing the technique and director of the Berkeley Search for Extraterrestrial Intelligence Research Center.
Radio waves emitted by an alien civilization living on the far side of the Milky Way would have to travelThese radio waves would be scattered as they encountered the turbulent, ionized plasma of interstellar space. This kind of disturbance is unique to interstellar space travel and has been previously observed among rapidly rotating stars calledThis scattering produces a distinctive 'twinkle' called 'diffractive scintillation' where the radio waves start to interfere with each other.
Astrophysics PhD candidate Bryan Brzycki, along with Siemon and his colleagues at SETI's Breakthrough Listen project, developed a program that can pick out radio waves with this interstellar twinkle from the"It's the first time where we have a technique that, if we just have one signal, potentially could allow us to intrinsically differentiate it from radio frequency...
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