Probing the Nature of Gravity

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This book is the result of an international Workshop on Gravity and the various attempts of checks of the role of General Relativity in Gravity that are based on space data. In its centre stand data on Gravitomagnetism, in particular the results of the Gravity Probe B ‘null-experiment’ that has measured the Lense-Thirring effect in orbit around the Earth, data derived from observation of astrophysical systems as well as from laser ranging of Earth-orbiting satellites. Tests of possible violations of Newton ’s inverse-square law and the equivalence principle are discussed as well as the problem of the constancy of the fundamental physics constants, and constraints on gravitational theory from cosmological observations, Quantum Gravity and Grand Unified Theory. In these respects emphasis is put on the assessment of uncertainty, i.e., to the question as to what extentd high-accuracy measurements are possible in space.