"The New Yorker" magazine has an article in its May 2nd, 2011 issue that may be legal to the watching of UFOs: Swanky Set-up by Rivka Galchen, Buzz 34 ff.
David Deutsch, who wrote "The Significant of Accuracy" and "The Exterior of Time without end", may not be curious in UFOs per se, but he does award insights about quantum mechanics, computing, physics and science, on the whole, which may perhaps be second hand by unmanageable UFO researchers to address that full of loopholes enigma.
Deutsch is the main delegation to the suspicion of quantum computing, which he suggests can address the Complex Worlds/Universes presumption, while giving out explanation of quantum's theories of superposition and embarrassing situation, that award a UFO connection conceivably.
If precise of you are about to to conjecture, intellectually, about the UFO mystery, you would do well to illuminate the New Yorker carrying out. It determination award grist for primary ruminations.