The paper appears to be entirely theoretical, the third paragraph noting the possibility of the potential for a UAP to be manoeuvrable craft of extra-terrestrial intelligence origin.
This is clarified in a later paragraph…
Loeb states the aim of this paper
This suggests that he believes that unknown alien technology will still be restricted by currently known principles of physics, in that any hypervelocity manoeuvres will be accompanied by sonic booms, fireballs and atmospheric ionizations – although I would guess that the absence of any of these signatures in a sighting would be used by UFO-fans as further validation that the alien technology was so advanced that it could counter these effects. This reminds me of two quotes – “God moves in mysterious ways” ... Read even more
