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To explain away dark matter, gravity would have to be really weird, cosmologists say

www.sciencemag.org

Adrian ChoDark matter, the invisible stuff whose gravity is thought to hold galaxies together, may be the least satisfying concept in physics.

But if you want to get rid of it, a new study finds, you’ll need to replace it with something even more bizarre: a force of gravity that, at some distances, pulls massive objects together and, at other distances, pushes them apart.

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