Which one of the "world's leading theoretical physicists" is this? I'm already having fun guessing:
To the extent that there are any unanswered questions left about the UFO phenomenon, they have to do with (a) the common neural basis of various weird human experiences (a genuinely interesting topic), and (b) how many of the historical UFO sightings are attributable to still-classified but probably mundane government programs, in the manner of the now-declassified Project Mogul (which was responsible for the Roswell incident), SR-71 and other spy-plane flights (a huge fraction of American UFOs), and treaty-violating Soviet ICBM tests (a similarly huge fraction of 1960s UFOs in the USSR). Often the alien-spaceship angle was deliberately let ride or actively played up as a cover story, particularly in the USSR.
But as one of the world's leading theoretical physicists says in the program, "You simply cannot dismiss the possibility that some of these UFO sightings are actually sightings from some object created by … a civilization perhaps millions of years ahead of us in technology."I can't prove the impossibility of that notion. But based on everything I've heard and seen about UFOs, I sure can dismiss it as probably not a productive hypothesis.
To the extent that there are any unanswered questions left about the UFO phenomenon, they have to do with (a) the common neural basis of various weird human experiences (a genuinely interesting topic), and (b) how many of the historical UFO sightings are attributable to still-classified but probably mundane government programs, in the manner of the now-declassified Project Mogul (which was responsible for the Roswell incident), SR-71 and other spy-plane flights (a huge fraction of American UFOs), and treaty-violating Soviet ICBM tests (a similarly huge fraction of 1960s UFOs in the USSR). Often the alien-spaceship angle was deliberately let ride or actively played up as a cover story, particularly in the USSR.