When talking about UFOs, it's important to remember that it's not a question of aliens from outer space.
UFO literally means “unidentified flying object.”
In fact, the term has been shifting recently, and many prefer to use “unidentified aerial phenomena” or UAP, to refer to these things in the sky that are utter unknowns.
Researchers in this field have described five obscure and seemingly unlikely features that true UFOs or UAPs.
Anti-gravity lift, including sudden and instantaneous acceleration, hypersonic velocity without signature, low observability, or "cloaking", and trans-medium speed.