Harvard Astronomers Theory On Aliens Earns Him Ridicule, But He's Standing By It

CAMBRIDGE, MA - MARCH 27: Avi Loeb, the chair of Harvard's University's Astronomy Department, poses for a portrait in Cambridge, MA on March 27, 2019. Loeb has ignited an academic firestorm by publishing an article suggesting that Oumuamua, a mysterious object that hurtled close to Earth in 2017, had perhaps been an artificial object sent from an extraterrestrial civilization. (Photo by Lane Turner/The Boston Globe via Getty Images)