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In 2018, astronomers faced a fundamental problem: A group mapping relatively nearby galaxies found two very small ones that apparently were totally lacking in dark matter. I know that sounds a little esoteric, but it's as shocking to astronomers as finding human bones next to dinosaur bones in a dig would be to a paleontologist. They shouldn't be there.
Simulations show some galaxies lose their dark matter in collisions. They show how galaxies can exist without dark matter, once thought impossibe.
Large galaxies may steal dark matter from smaller galaxies they nearly collide with, new research suggests.
Princeton's Shany Danieli discovered in 2018 that some galaxies are missing their dark matter. Now she and a team of modelers have now determined that this does not, in fact, undermine the standard model of galaxy formation.
In simulations, collisions cause smaller star groupings to lose material