Abstract
“If they are out there, where are they?” That is the conundrum famously expressed more than 50 years ago by the Italian-born physicist Enrico Fermi when referring to the possibility that intelligent extraterrestrial civilizations may lie beyond the confines of our solar system. Given the vast age of the universe and its enormous number of Sun-like stars, it seems logical that the Earth is not the only place where intelligent life has evolved. Yet for the past half century, researchers have been actively looking for signs of such extraterrestrial civilizations and thus far have come up empty-handed.
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