SUMMARY: It's been a month since NASA launched the Gravity Probe B; an experiment designed to test Einstein's predictions about gravity and relativity, and so far, the spacecraft is working well. It's in the correct orbit and will begin the science phase of its mission next month. It will continue taking precise measurements of the Earth's gravity over the next 13 months to test two predictions: how space and time are warped by our planet, and how the Earth drags space-time around with it as it rotates.
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