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Dark Matter: Still needed
hourglass nebula, eye
gmcdavid

There was a recent media kerfuffle about MOND (Modified Newtonian Dynamics), an alternative physical theory that supposedly eliminates the need to have dark matter be a major part of the universe.

However, as Ethan Siegel and Sean Carroll pointed out, this alternative theory only works for one set of observations that are explained by dark matter. There are others about which MOND has nothing to say.

Hence dark matter explains much more than MOND, and for that reason alone is to be preferred as a physical theory.


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