Cuk Matija
Department of Physics and Astronomy, University of British Columbia, 6224 Agricultural Road, Vancouver, BC V6T 1Z1, Canada.
Science. 2007 Oct 12;318(5848):244. doi: 10.1126/science.1146984.
The origin of the Moon's nonnegligible orbital eccentricity of 0.053 has no theoretical explanation. Lunar laser ranging indicates that tides on Earth are currently increasing the Moon's eccentricity. However, ocean tides were likely much weaker during the first billion years, allowing lunar tides to damp any primordial lunar eccentricity very early on. During the tidally driven expansion of its orbit, the Moon must have been affected by two substantial resonances related to Jupiter and Venus, passage through which may have generated today's lunar eccentricity.
月球0.053的不可忽略的轨道偏心率的起源尚无理论解释。月球激光测距表明，地球的潮汐目前正在增加月球的偏心率。然而，在最初的10亿年里，海洋潮汐可能要弱得多，使得月球潮汐在很早的时候就消除了任何原始的月球偏心率。在其轨道由潮汐驱动的扩张过程中，月球必定受到了与木星和金星相关的两个显著共振的影响，通过这些共振可能产生了如今月球的偏心率。
