Oumuamua: first alien solar-sail probe to visit the Solar System? (science video)
Avi Loeb, the Frank B. Baird, Jr., Professor of Science and astrophysicist at Harvard University, explains why in his new book, Extraterrestrial: The First Sign of Intelligent Life Beyond Earth, he examines the evidence that our first interstellar visitor to be spotted in our solar system, Oumuamua, might be the first sign of intelligent life beyond earth.
