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May 29, 2020

Half the matter in the universe was missing—we found it hiding in the cosmos

Posted by in category: cosmology

In the late 1990s, cosmologists made a prediction about how much ordinary matter there should be in the universe. About 5%, they estimated, should be regular stuff with the rest a mixture of dark matter and dark energy. But when cosmologists counted up everything they could see or measure at the time, they came up short. By a lot.

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