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DARK energy may not exist, according to an international team of astronomers who have used an X-ray satellite to count galaxy clusters in the early universe. If they are right, the expansion of the universe is not speeding up and the scientific community has been taken in by a huge cosmic mirage.

The idea of dark energy was first suggested in 1998 when a team led by Saul Perlmutter at the University of California at Berkeley reported that distant supernovae appeared fainter than they should, given their distance from the Earth. This could be explained by the expansion of the…

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