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Published online 12 January 2006 | Nature | doi:10.1038/news060109-11
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Is dark energy changing?
Ancient gamma-ray bursts suggest our Universe used to be different..
Contrary to all expectations, the mysterious dark energy that is pushing the Universe apart may be changing with time.
By observing distant, powerful bursts of gamma rays (γ-rays), Brad Schaefer says he has preliminary evidence that the strength of dark energy is different today from when the Universe was very young.
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