There’s little question that our skies, worldwide, have been entered into by phenomena that appear to be extremely advanced craft. For an accessible and journalistically responsible review of why that conclusion is so well justified, take a look at Leslie Kean’s UFOs: Generals, Pilots, and Government Officials Go on the Record. So, they are here. That is a fact. But what that means and what we can or should do about it are the real issues. Let’s start with the possibilities of what they might be.