
FILE - Harvard physicist Avi Loeb, left, listens as former NASA astronaut Dr. Mae C. Jemison, speaks during a press conference in New York on April 12, 2016. (AP Photo/Bebeto Matthews, File)

FILE - Harvard physicist Avi Loeb, left, listens as former NASA astronaut Dr. Mae C. Jemison, speaks during a press conference in New York on April 12, 2016. (AP Photo/Bebeto Matthews, File)