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It is a human trait, dictated by our limited understanding of the cosmos. A Black Hole, Dark matter etc is called so because we cannot directly see the object, only its effects. It fits the present theories, but someday there will be an observation of some effect that does not fit and the theory will change. Its how we have advanced in our understanding and it will continue as long as our race exists. The facts are the effects, the reason for them is the theory.
Just my 2 bobs worth ( I'm still going metric)
Bill
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