General relativity, our current best understanding of gravity, has passed yet another test—this time on a much larger length scale. Ever since relativity's first confirmation in 1919, when Sir Arthur Stanley Eddington observed that the light from distant stars was shifted by the mass of the sun, direct tests have been confined to length scales smaller than our solar system. No test to date has stringently probed general relativity's applicability to the length scales of the universe itself.
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Wednesday, March 17, 2010
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