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Beleaguered mission measures swirling space-time at last

作者:终缓胴    发布时间:2019-03-07 01:13:01    

SIX years after NASA’s Gravity Probe B stopped collecting data, the mission has finally found evidence of an effect of general relativity called frame-dragging. But the result comes years after other projects measured the effect to greater precision. The $750 million mission launched in 2004 to test Einstein’s general theory of relativity by measuring how Earth warps the fabric of space-time. The warping was expected to slightly alter the spin axis of four gyroscopes in the probe, but the measurements were much noisier than expected, complicating the analysis. In 2007,

 

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