Fourth Test of General Relativity: New Radar Result

Details Fourth Test of General Relativity: New Radar Result Fourth Test of General Relativity: New Radar Result

May 1971

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1971phrvl..26.1132s&link_type=abstract

Physical Review Letters, vol. 26, Issue 18, pp. 1132-1135

Physics

81

Scientific paper

New radar observations yield a more stringent test of the predicted relativistic increase in echo times of radio signals sent from Earth and reflected from Mercury and Venus. These "extra" delays may be characterized by a parameter λ which is unity according to general relativity and 0.93 according to recent predictions based on a scalar-tensor theory of gravitation. We find that λ=1.02. The formal standard error is 0.02, but because of the possible presence of systematic errors we consider 0.05 to be a more reliable estimate of the uncertainty in the result.

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