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Astronomers find evidence of missing matter

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5:29pm, October 25, 2002

If astronomers were in charge of a lost-and-found department, they would have been fired long ago. Most have come to terms with the notion that at least 90 percent of the matter in the universe must consist of some strange, dark material that they cannot directly detect. More embarrassingly, astronomers had lost track of most of the baryons—ordinary, visible matter made of protons, electrons, and neutrons.

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