For decades, astronomers have searched for signs of extraterrestrial technology – radio signals, lasers or excess heat from hypothetical megastructures. However, a new theoretical study raises another question: If the signals reached Earth undetected, how likely are we to detect them now? Claudio Grimaldi from École Polytechnique Fédérale de Lausanne has estimated how many alien signals would have to pass by Earth for us to catch them today. The work was published in AstroJournal.
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