When writing about unknown aerial phenomena (UAPs), it is soooo tempting for writers to presume that at some of them are sightings of actual objects that are actually moving at their apparent high velocities with their apparent rapid accelerations. They look like that, but many are not that.

The term "unidentified aerial phenomena" is better than "unidentified flying objects" because it rejects that presumption — but we need to remember not to let the presumption sneak in later.

I find it implausible that alien visitors with high technology would fail to conceal their presence from us, supposing they were trying to do conceal it.