Harvard Astrophysicist Avi Loeb Explains Why Aliens Exist

Avi Loeb is a Harvard Astrophysicist and best-selling author of books such as ''Extraterrestrial: The First Sign of Intelligent Life Beyond Earth'' and ''The Elephant in the Universe: Our Hundred-Year Search for Dark Matter''. He is known for his contributions to space exploration and research on extraterrestrial objects.