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Gravity Probe B spacecraft is about halfway.

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Gravity Probe B Spacecraft.
Gravity Probe B spacecraft is about halfway through the initialization.

Update on Gravity Probe B.

Designed to test two of Einstein's predictions about the nature of gravity and relativity, NASA's Gravity Probe B spacecraft is about halfway through the initialization and checkout phase of its mission. Mission operators have transmitted more than 5,000 commands to the spacecraft, and everything seems to be functioning properly, including its gyroscopes and the targeting system that keeps it locked onto the guide star: IM Pegasi. If everything continues to go as planned, it should begin scientific operations in August, and deliver the final results in a year.

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