The speed of gravity has been measured for the first time. The landmark experiment shows that it travels at the speed of light, meaning that Einsteins general theory of relativity has passed another test with flying colours. Ed Fomalont of the National Radio Astronomy Observatory in Charlottesville, Virginia, and Sergei Kopeikin of the University of Missouri in Columbia made the measurement, with the help of the planet Jupiter.
http://www.newscientist.com/news/news.jsp?id=ns99993232
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