What do you guys think of UFO's?

[Adny]

Easily explained as military aircraft testing.

Do you recognize that such an explanation is just as valid as saying the aircraft belongs to sentient beings from outer space?

Militaries around the world test their various toys all the time - I know for a fact that militaries exist and they are capable of creating (and have created in the past) things identical to the one you described, whereas there is absolutely no evidence/proof of "space scientists". It's quite a stretch to say space men made it when there is a perfectly logical explanation sitting right in front of us.