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Science 4 October 2002:
Vol. 298. no. 5591, pp. 72 - 73
DOI: 10.1126/science.1077124
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Perspectives

COSMOLOGY:
The Cosmic Web of Baryons

Joel N. Bregman

About 20% of the matter in the universe is present as "baryons," which form the stars and galaxies in the local universe. But the visible baryonic matter only adds up to about one-tenth of the baryonic matter that existed when the world was young. In his Perspective, Bregman reviews recent studies aimed at tracking down this missing matter. The evidence now points to a cosmic "web" of baryons in intergalactic space, but quantitative data on the amount of matter in the web remain elusive.

The author is in the Department of Astronomy, University of Michigan, Ann Arbor, MI 48109, USA. E-mail: jbregman{at}umich.edu

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Science. ISSN 0036-8075 (print), 1095-9203 (online)