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Nature 461, 740-741 (8 October 2009) | doi:10.1038/461740a; Published online 7 October 2009

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Cosmology: Dark is the new black

Richard Massey1

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Rival experimental methods to determine the Universe's expansion are contending to become the fashionable face of cosmology. Fresh theoretical calculations make one of them the hot tip for next season.

Since the Big Bang, the Universe's initial expansion has been gradually slowed by the gravitational pull from the mass it contains. Most of this mass is in the form of invisible and mysterious dark matter.

  1. Richard Massey is at the Institute for Astronomy, Royal Observatory Edinburgh, Blackford Hill, Edinburgh EH9 3HJ, UK.
    Email: rm@roe.ac.uk

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