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ON THE 50TH ANNIVERSARY of the publication of Albert Einstein's general relativity, his theory of gravitation, it is appropriate to reconsider the observational support of this theory and its place in contemporary physics. Within the framework of most of today's specialized physical disciplines, gravitation appears superficially to be of little significance. Nonetheless, some of the most enigmatic and puzzling of physical problems intimately involve this phenomenon.
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R. H. Dicke (1967) studied this question.
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