Astronomy and Astrophysics – Astrophysics – General Relativity and Quantum Cosmology
Scientific paper
2004-12-11
Adv.Space Res.37:67-71,2006
Astronomy and Astrophysics
Astrophysics
General Relativity and Quantum Cosmology
8 pages, invited talk given at ``35th COSPAR Scientific Assebly,'' July 18-24, 2004, Paris, France
Scientific paper
10.1016/j.asr.2005.05.013
Laser pulses fired at retroreflectors on the Moon provide very accurate ranges. Analysis yields information on Earth, Moon, and orbit. The highly accurate retroreflector positions have uncertainties less than a meter. Tides on the Moon show strong dissipation, with Q=33 \pm 4 at a month and a weak dependence on period. Lunar rotation depends on interior properties; a fluid core is indicated with radius ~20% that of the Moon. Tests of relativistic gravity verify the equivalence principle to \pm 1.4 x 10^{-13}, limit deviations from Einstein's general relativity, and show no rate for the gravitational constant $\dot{G}/G$ with uncertainty 9 x 10^{-13} 1/yr.
Boggs Dale H.
Ratcliff James Todd
Turyshev Slava G.
Williams James G.
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