Stephen Hawking warns that humanity should not respond to aliens in case they kill us all

If we actually end up discovering aliens then they'll probably just wipe us all out, Stephen Hawking has said. When we made contact with any aliens it would probably be like when the Native Americans first met Christopher Columbus. And, in that case, things "didn't turn out so well" for the people being visited, Professor Hawking has said. Stephen Hawking made the warning in a film posted online, Stephen Hawking's Favorite Places. It showed him taking a spacecraft across the cosmos, visiting different locations across the universe.