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Dark energy dates back nine billion years Nov 17
The mysterious substance known as dark energy has been fuelling the expansion of the universe for at least nine billion years, according to astronomers in the US. Adam Riess of Johns Hopkins University and colleagues made the discovery by using the Hubble Space Telescope to study ancient exploding stars. They have also concluded that dark energy appears to be related to the "cosmological constant" first proposed – and then retracted -- by Albert Einstein.
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