Scientist wonders if UFOs could be relics of an ancient civilization on Earth

On a recent article on Medium, Avi Loeb, a Harvard professor and the head of the Galileo Project, which aims to search for evidence of extraterrestrial life and technology, proposed a provocative idea: what if some of the unidentified aerial phenomena (UAPs) that have been observed by military pilots and astronomers are not alien spacecraft, but rather relics from an earlier civilization on Earth?

Loeb argues that the possibility of a “technosignature” from a long-lost human civilization should not be dismissed without evidence.

He suggests that such a civilization could have existed before the last ice age, when sea levels were much lower and large land masses were exposed.

“Is it possible that the devastating global warming event was caused 252 million years ago by industrial pollution from a technological civilization? This would have required first intelligence to emerge only 6 percent earlier in the 4,540-million-year history of Earth,” Loeb writes....<<<Read More>>>....