Galaxies’ missing mass may hide in gas clouds

Huge amounts of cold matter surround star-containing regions, study finds

HIDDEN GAS  Galaxies like Messier 81, a spiral galaxy in the constellation Ursa Major, are surrounded by vast quantities of cold, nonluminous gas, a new study finds.

JPL-Caltech/NASA and S. Willner/Harvard-Smithsonian CfA

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