"Dark Matter" is nothing more than a hypothesis concocted to try and explain a few anomalies with gravity and the structure of the Universe. They have no viable candidate for what it might be and they really still haven't much of a clue as to the physical dynamics of the stuff (except in very broad terms). So, to say it's real is stretching credulity a little too far, yet.
The best they can say is there's something there they can't detect and it's having a profound effect on the the structure of the galaxies in particular and the Universe as a whole.
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