What Is Dark Matter Made Of?

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Science  26 Nov 2004:
Vol. 306, Issue 5701, pp. 1485-1488
DOI: 10.1126/science.1102823

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Some 25% of the mass of the universe consists of dark (that is, nonluminous) matter. The nature of this dark matter remains unknown. In their Perspective, Zioutas et al. discuss attempts to detect neutralinos and axions, the two leading particle candidates for dark matter, in astrophysical studies. They show that astrophysical and cosmological observations, some of which have been overlooked in the past, can shed light on particle physics problems that are beyond the reach of accelerator experiments.