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Step (satellite test of the equivalence principle)

Sumner, T.J. and Anderson, J. and Blaser, J.P. and Cruise, A.M. and Damour, T. and Dittus, H. and Everitt, C.W.F. and Lockerbie, N.A. and Pegrum, Colin (2007) Step (satellite test of the equivalence principle). Advances in Space Research, 39 (2). pp. 254-258. ISSN 0273-1177

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STEP is one of a number of missions now being developed to take advantage of the quiet space environment to carry out very sensitive gravitational experiments. Using pairs of concentric free-falling proof-masses, STEP will be able to test the equivalence principle (EP) to a sensitivity at least five orders of magnitude better than currently achievable on ground. The EP is a founding principle of general relativity and STEP is the most sensitive experiment of this type planned so far, aiming at 1 part in 1018. 2007 Published by Elsevier Ltd on behalf of COSPAR.