•Alien spaceship—likely classified as “unknown”. Plausible bias towards high quality as again we might expect to find more of them around military bases.
I’m not sure why we would expect that. If I were constructing a model of what I would expect of alien visitations, I don’t think that would be part of it.
If I were constructing a model of what I would expect from alien visitations though, I doubt it would resemble any of the recorded observations at all; I suspect that they would be either completely open and unambiguous, or totally unnoticed (if a race with the technology for casual interstellar travel wanted to avoid attention, I expect that they could avoid it completely.)
I’m not sure why we would expect that. If I were constructing a model of what I would expect of alien visitations, I don’t think that would be part of it.
If I were constructing a model of what I would expect from alien visitations though, I doubt it would resemble any of the recorded observations at all; I suspect that they would be either completely open and unambiguous, or totally unnoticed (if a race with the technology for casual interstellar travel wanted to avoid attention, I expect that they could avoid it completely.)