The interstellar comet will make its closest approach to Earth on December 19th. In this throwback episode of The Current, I talk to Harvard astrophysicist Dr. Avi Loeb, who thinks it’s more than a pile of dust and ice. He says it's moving too fast and has a strange trajectory, among other things. Could it be extraterrestrial? Learn more about your ad choices. Visit megaphone.fm/adchoices
