One tiny twist for a gyroscope, one giant leap for theoretical physics
Was Einstein's General Theory of Relativity correct? The initial evidence that it is came from a pre-existing anomoly in the orbit of Mercury. More evidence came 15 years later when starlight was seen to be bent by the Sun. Today there a a number of competing theories of gravity and a soon-to-be-conducted experiment in low-Earth orbit may tell us that Einstein's theory still reigns, or that someone else has improved on it. If the latter, much of the foundation of modern astrophysics will probably dissolve and need to be replaced.
There's a fascinating (if short on details) article called "Einstein, the first spin doctor" in the The Guardian for last Saturday [via Dave Farber's IP list].
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