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Nature 452, 851-853 (17 April 2008) | doi:10.1038/nature06896;
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A massive binary black-hole system in OJ|[thinsp]|287 and a test of general relativity
Tests of Einstein|[rsquo]|s general theory of relativity have mostly been carried out in weak gravitational fields where the space-time curvature effects are first-order deviations from Newton|[rsquo]|s theory. Binary pulsars provide a means of probing the strong gravitational field around a neutron star, but strong-field effects may be best tested in systems containing black holes.
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