UFOs Are a Common Sight, Former Military Official Tells Congress (Non Paywall in comments)

Extraordinary claims require extraordinary evidence, full stop.

There's nothing saying that this isn't something of our own creation.

The Roswell incident exposed the existence of Mylar -- something human-made, classified, but other-worldly in appearance and texture to anyone who might have seen it at that time... Now something mundane enough to be used as potato chip bags.