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By J. Xavier Prochaska
University of California at Santa Cruz 

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


(The Conversation is an independent and nonprofit source of news, analysis and commentary from academic experts.)

J. Xavier Prochaska, University of California, Santa Cruz and Jean-Pierre Macquart, Curtin University

(THE CONVERSATION) In the late 1990s, cosmologists made a prediction about 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.

The sum of all the ordinary matt...

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