A clock ensemble, ACES (Atomic Clock Ensemble in Space), is to fly to the International Space Station in 2014. This caesium clock, because it will be affected only by microgravity, will be 100 times the accuracy of GPS clocks and will be a common reference point for ground based atomic clocks which could reveal if a physical 'constant' called alpha is not constant after all. (See 'Space station to host super-clock', New Scientist, 31 July 2010, p5)
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