A new theory of gravity might explain the curious motions of stars in galaxies. Emergent gravity, as the new theory is called, predicts the exact same deviation of motions that is usually explained by invoking dark matter.
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http://phys.org/news/2016-11-theory-gravity-dark.html
More information: Emergent Gravity and the Dark Universe, E. P. Verlinde, 7 Nov 2016. arxiv.org/abs/1611.02269
http://www.dutchnews.nl/news/archive...ry-of-gravity/