SUMMARY: NASA's Gravity Probe B arrived at Vandenberg Air Force Base on Friday, July 11 to begin launch preparations. Once launched, the spacecraft will use four ultra-precise gyroscopes to test two predictions of Einstein's General Theory of Relativity: how space and time are warped by the Earth, and how the Earth's rotation drags space-time around with it. If all goes well, the spacecraft will launch on board a Boeing Delta II rocket in late 2003.

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