Extremely deep observations of the Coma galaxy cluster with the Chandra X-ray Observatory have found that the gas between galaxies, where the vast majority of the baryons lie, is far less viscous than expected.
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Walker, S.A. Coma cluster gives up secrets of intergalactic gas. Nat Astron 3, 798–799 (2019). https://doi.org/10.1038/s41550-019-0821-0