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How Hot Is Dark Matter?

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Science  01 Jun 2012:
Vol. 336, Issue 6085, pp. 1091-1092
DOI: 10.1126/science.336.6085.1091

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For decades, astronomers have thought that some unseen "dark matter" provides the gravity that holds the galaxies together. Scientists still don't know what dark matter is, but that could soon change. Within years, physicists might be able to detect particles of the stuff. Even if they can't, astronomers and astrophysicists may be able to narrow in on dark matter's most basic properties by astronomical means alone.

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