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Testing Einstein

This is a prototype gyroscope from the Gravity Probe B experiment. On 4 May 2011 the Gravity Probe B team announced that they had confirmed two predictions of Einstein’s general theory of relativity: that a massive body such as the Earth should warp and twist the space-time around it. Gyroscopes like this one - amongst the most perfect spheres ever made - were central to the experiment. Find out more on our Stories from the Stores blog

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Taken on May 29, 2009