EXCLUSIVE: Stephen Hawking on What Existed Before the Big Bang

In this exclusive clip, Tyson asks Hawking your standard softball interview question: what was around before the big bang? In other words, what happened before the moment the universe began? Check out Hawking’s answer: “The boundary condition of the universe...is that it has no boundary,” Hawking says. -- FOLLOW POPULAR SCIENCE https://www.popsci.com Facebook: https://www.facebook.com/popsci Twitter: https://www.twitter.com/popsci Instagram: https://www.instagram.com/popsci Snapchat: https://www.snapchat.com/add/popularscience Pinterest: https://www.pinterest.com/popularscience