If there's an advanced civilization in the TRAPPIST-1 system living on multiple worlds, there's a way to eavesdrop on their conversation from world to world. Researchers directed the Allen Telescope Array at the TRAPPIST-1 system during times of "planet-planet occultations," when two of the worlds in the system are aligned with Earth and their star. Communications directed at the planet could spill over and be detectable from Earth. No signals were detected.


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Source: SETI Scientists Scan TRAPPIST-1 for Technosignatures