Steven Spielberg says he has "a very strong sneaking suspicion that we are not alone here on Earth right now." During a SXSW keynote conversation, he added, "No one should ever think that we are the only intelligent civilization in the entire universe. I've always believed, even as a kid, that we weren't alone. That just goes without saying. The big question is, are we alone now? And have we been alone over the last 80 years? And really, have we been alone over the last 3,000 years?" Photo via Shutterstock