The TRAPPIST-1 system is a compact system of at least seven exoplanets with sizes similar to Earth. Penn State and SETI Institute astronomers spent 28 hours scanning this system for alien radio technosignatures with the Allen Telescope Array. The project marks the longest single-target search for radio signals from TRAPPIST-1. Although the astronomers didn’t find any evidence of extraterrestrial technology, their work introduced a new way to search for radio technosignatures in the future.
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