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Nature 425, 335 (25 September 2003) | doi:10.1038/425335a

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Cosmologists cluster to plot course towards dark energy

Geoff Brumfiel

For five years, cosmologists and theoretical physicists have been wrestling with the bombshell discovery that a mysterious entity called 'dark energy' may be responsible for two-thirds of the energy and matter in the Universe.Researchers are today no closer to defining dark energy, although they rely on it to explain the 1998 discovery that the Universe's expansion is accelerating, rather than slowing down under the influence of gravity, as had been widely assumed.