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.
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机译：向月球后向反射器发射的激光脉冲提供非常精确的范围。分析产生有关地球，月球和轨道的信息。高度精确的后向反射器位置的不确定性小于一米。月球上的潮汐显示出较强的耗散性，每个月Q = 33 \ pm 4并且对周期的依赖性较弱。月球旋转取决于内部特性。表示流体核心的半径约为月球半径的20％。相对论引力的检验验证了\ pm 1.4 x 10 ^ {-13}的等价原理，限制了与爱因斯坦广义相对论的偏差，并且对不确定性为9 x 10 ^的引力常数$ \ dot {G} / G $没有显示任何比率。 {-13} 1 /年。
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