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Einstein added the cosmological constant because it was the view of Newton that the universe was static and because there was no reason in the maths why this term shouldn't exist.
Einstein revered Newton and thus modified his equations to make the universe static as Newton had postulated.
Einstein immediately rejected the cosmological constant as soon as Hubble produced experimental evidence that the universe was expanding. This is the mark of a great scientist.
Einstein never accepted the physical existance of black holes. He had a rather contrived reason why they could never exist in the actual universe.
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