Quote:
Originally Posted by Gillianren
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.
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Indeed; I understand but because we don't know the properties of hypothetical ET craft I tend not to apply so low an a priori probability, or likelihood, to what an ET craft might look like.
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