Alien ContactAliensBizarre ScienceExterrestrial TheoryFamous People and UFOsSpace Exploration Don’t talk to aliens, warns Stephen Hawking (VIDEO) by Alien UFO Sightings September 17, 2011 by Alien UFO Sightings September 17, 2011 The aliens are out there and Earth had better watch out, at least according to Stephen Hawking. He has suggested that extraterrestrials are almost certain to exist — but that instead of seeking them out,… Like this:Like Loading...