月球的双面结构以及形心相对于质心的偏离

The Lunar Dichotomy Structure and Deviation of Its Shape Center from Mass Center

摘要: 根据宇宙飞行器对月面的考察，发现月球的正面和背面的结构有很大不同。根据月球形状模型(CE-1)，表明月球的平均形状中心偏离质量中心达1117米。月球的双面性结构和形心的偏离在太阳系中是非常特殊的，一定有共同的演化原因。作者认为；在约35亿年前，在月球形成同步自转之后，由于地球强大的引力场以及月球离地球比较近，只有较少的陨石落在了月球正面，而绝大多数陨石落于月球背面，并且形成了较厚的堆积层。根据月球形心相对于质心的偏差，我们可以估计这个堆积层的厚度可达二千多米，其总质量大约只有月球质量的1.1 × 10⁻⁴。

Abstract: According to the expedition of spacecraft for lunar crust, it is found that the surface structure on lunar farside quite differs from that on the nearside. According to the lunar figure model (CE-1), the lunar shape center is deviated 1117 m from the lunar mass center. The lunar dichotomy structure and the deviation of the shape center are very specific in solar system, and it must have a common evolutionary reason. The author suggested that after the Moon formed the synchronous rotation in about 3.5 billion years ago, because the Earth’s strong gravity and the Moon was near to the Earth, only a litter meteorite fell down to the nearside of the Moon, and the most meteorite fell down to the farside of the Moon, and formed a thick cover layer. According to the deviation of the lunar shape center from the mass center, we may estimate that the average thickness of the cover layer is about two thousand metres, and the mass of the cover layer is only about 1.1 × 10⁻⁴ of the lunar mass.