Quote:
Originally Posted by A.DIM
So if we had conclusive evidence for alien spaceships it'd then be reasonable to "compare" (whatever that, in quotes, means) possible conclusions?
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Well, yes. As it stands, we compare the likelihood that a sighting is an airplane, a helicopter, or a sky lantern. This is because we know what properties those have. However, we do not know what properties an alien spacecraft might have, so there's no logical reason to assume that anything has the properties of an alien spacecraft. It is Unknown, as per the definition.