Unidentified Is Not Proof: Skepticism, Bias, and the Search for Evidence in UFO Claims

To the point

Public fascination with UFOs persists despite no solid proof of alien visitation, because eyewitness and radar reports can be unreliable and our prior beliefs bias what we observe, unidentified simply means not yet identified, and while intelligent life elsewhere remains plausible there is no robust evidence of visitation, so we should investigate carefully and doubt sensational claims, a stance echoed by thinkers like Carl Sagan and Seth Shostak.