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Ghostly galaxies lacking dark matter challenge alternative gravity theories

Original: A collision may have left these galaxies without dark matter. That spells trouble for alternative gravity theories. The

Astronomers report a triplet of faint galaxies that appear to contain little or no dark matter, possibly the result of an ancient galactic collision. The finding is significant because modified-gravity theories, which argue dark matter is unnecessary and gravity itself behaves differently, predict such galaxies should not exist. If confirmed, the results strengthen the case for dark matter as a real substance and raise new questions about what it is made of.

Why now: New evidence from dark-matter-poor galaxies directly undermines alternative gravity theories, a long-running debate in cosmology.

dark matterQuanta Magazinegalaxiesmodified gravity theories

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Evidence

• A collision may have left these galaxies without dark matter. That spells trouble for alternative gravity theories. The post Triplet of 'Ghostly' Galaxies Hints at What Dark Matter Is - and Isn't… # science # dark -matter # galaxies https://www. quantamagazine.org/triplet-of-… · Econopass@flipboard.com · 1

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