The Fermi paradox just got worse. Why haven´t we seen *the unmanned space probes* of the purported extraterrestrial civilizations? But maybe we simply haven´t been looking hard enough. Sabine never makes an explicit tie-in to Avi Loeb´s quixotic quest for such probes in our planetary backyard, but if the paper is correct, maybe the rest of us should go looking, too!
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