News of the WeekPhysics

Confirmation of Gravity's Speed? Not So Fast

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Science  17 Jan 2003:
Vol. 299, Issue 5605, pp. 323-324
DOI: 10.1126/science.299.5605.323a

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SEATTLE-- Last week, the media were awash with reports that astronomers had confirmed Einstein's prediction that gravity crosses space at the speed of light. Not necessarily, say some physicists. The work described at the annual meeting of the American Astronomical Society here, they warn, may have been nothing more than a test of the speed of light itself.