Why Is There Dark Matter?

(Preposterous Universe) – Sean Carroll:

Years ago I read an article by Martin Rees, in which he surveyed the options for what the dark matter of the universe might be. I forget the exact wording, but near the end he said something like “There are so many candidates, it would be quite surprising to find ourselves living in a universe without dark matter.”

Why do we live in a universe with five times as much dark matter as ordinary matter, anyway? Is the existence of dark matter indeed unsurprising, or is it an unusual feature that we should take as an important clue as to the nature of our world? …

preposterousuniverse…2015/07/07/why

MACS J1206 galaxy cluster

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