If alien signals have already reached Earth, why haven't we seen them?
Phys.org
February 16, 2026
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 should we realistically expect to detect today?
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Originally published on Phys.org on 2/16/2026