For Saul Perlmutter, a University of California at Berkeley cosmologist who led one of the teams that discovered dark energy and is now leading the SNAP effort, a final answer is tantalisingly near, but it was finding the question that was the real joy. “We’ve gotten amazingly close to what we feel is a full picture,” he said. Dark energy, he said, was “the little crack in the blind that gives us some insight into what we’ve never thought before”.
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