I guess everyone forgot the time when a whole fleet of UFO's flew over the Capitol Building in 1952. Yes, it did happen, and no it's never been debunked.
This leads me to believe that Hawking's mind is being controlled by the Black Ops Government in order to debunk any thoughts about aliens already visiting our world. Or he has just been extremely sheltered by his caretakers and colleagues. I mean, has he never seen any of the UFO footage captured by NASA? Does he believe that everyone who has claimed to have been abducted by aliens to just be making it all up? Mr. Hawking please take a look at this video.
This Video proves we are not alone in OUR solar system. Hundreds of extraterrestrial spacecraft can clearly be seen in this footage. Notice how the astronaut comments that the objects they are seeing are in the foreground? They are clearly NOT in the foreground. My eyes don't lie but NASA does. This is proof. This is "NASA's Smoking Gun" Here's the full version put together by a friend of mine David Sereda who has been featured on the History channel for this same video.
Referring to the picture above, in 1942 three months after the Japanese attack on Pearl Harbor, a UFO appeared over Los Angeles between February 24th and 25th. Assumed to be another air strike from Japan. The UFO sparked a massive anti-aircraft military attack. The the true identity of the object is still unknown today.
Realize what you're being told and the message that's being brought forward by this. Attain the knowledge you need so the wool isn't pulled over your eyes. Remember that the government will do anything and everything to distract you from the truth. Attain your attainable mind.