[jeffreyrogers]

> But nope... the fact that the UFO topic is linked to fringe, new age, and wacky stuff means that it can't be discussed and must be absolutely dismissed.

I think it's more that the recent claims about the UFOs (moving at hypersonic speeds but leaving no emissions nor heating the atmosphere) are so implausible that they don't fit our current understanding of physics.

[api]

I thought several of these did show infrared heating? Or maybe I'm thinking of a different case than you.

In any case a lack of heat is problematic. Even if they're using some unknown means of propulsion, the second law of thermodynamics is absolutely settled bedrock science. They must dump waste heat somewhere.