Photo: Bulk of Missing "Normal" Matter Found in Cosmic Web

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Filaments of dark matter crisscross the space between galaxies in a computer simulation of the universe showing a region of space about 1.5 billion light-years a side.

Using the ultraviolet light from distant quasars, astronomers have found about 40 percent of the missing "normal" matter in the cosmos in hot gas clustered around these filaments.

Image courtesy University of Colorado at Boulder

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