Putting Einstein to the test

By Davide Castelvecchi, 15:56 PM April 15, 2008

From Jacksonville, Fla., at a meeting of the American Physical Society

NASA's longest-running mission is accomplished—almost.

Gravity Probe B went into orbit in 2004 after 4 decades of development and seven NASA reviews that often threatened to cancel it. It was meant to test general relativity, Albert Einstein's theory of gravity (SN: 11/5/05, p. 302: Available to subscribers at A matter of gravity; 11/1/03, p. 280: A Spin through Space-Time).

The $700 million probe incorporated numerous techn...

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