This faraway galaxy may be completely devoid of dark matter

On the surface, a galaxy 250 million light-years from Earth seems like any other, but a deeper look reveals a puzzling quirk: It seems to have no dark matter. 

If these galaxies are ultimately confirmed to be devoid of dark matter, it could upend fundamental theories about the making of galaxies (dark matter is considered essential to this process). And that, in turn, could rule out a leading candidate for the mysterious substance, called cold dark matter. 

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