Last month, Dr. Loeb led an expedition to retrieve fragments of the fireball off the western Pacific seafloor. On June 21, he claimed that he had. And that, he says to the chagrin of many of his colleagues, may be evidence of extraterrestrial life. “Not biological creatures, the way you see in science fiction movies,” Dr. Loeb said. “It’s most likely a technological gadget with artificial intelligence.” NYT

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