The Proof Behind Extraterrestrials!!
There are none because there is absolutely, positively, without any question, and regardless of any eyewitness report, no concrete evidence that any flying machine composed from an extraterrestial source that can be constituted as proof. That is the whole truth and nothing but the truth. No sighting, no picture, no video, no left-behind evidence of any kind including past carvings, inscriptions, man-made structures has ever given the slightest indication in the definitive proof that any extraterrestrial life of any nature from outside the borders of our solar system, galaxy, or universe has ever existed or will ever exist. These tee-vee shows are just a bunch of crap for your viewing pleasure and the production staff are laughing all the way to the bank.
"It's as nose as the plain on your face."