If alien signals have already reached Earth, why haven't we seen them?

For decades, scientists have searched the skies for signs of extraterrestrial technology. A study from EPFL asks a sharp question: if alien signals have already reached Earth without us noticing, what ...
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Alien Signals Reached Earth: Why No Detection Yet?

For decades, scientists have searched the skies for signs of extraterrestrial technology. A study from EPFL asks a sharp ...