一、概述 地球是作为一员星球在银河系中运动和发展的。因而,它的形成和演化是应服从于一般星球形成和演化规律的。特别是与地球相邻近,而且特征也相近的星球,在形成和演化方面应有更多共同特点。 比较法是认识、鉴别事物的重要方法。事物是从与其他事物比较中反映出它的特性和共性的,在现在科学水平上,能与地球相比较的天体在亿万星球中还是极少数,我们将这些与地球相邻近,而特征又近似的天体称类地天体。类地天体主要分布在离太阳较近的内行 I. Overview The Earth is a member of the planetary movement and development in the Milky Way. Therefore, its formation and evolution should be subject to the formation and evolution of the general rules of the planet. In particular, planets that are adjacent to Earth and are similar in features should have more common features in their formation and evolution. Comparative law is an important way to recognize and identify things. Things reflect their characteristics and commonalities in comparison with other things. At present, the celestial bodies that can compare with the earth are still very few among the hundreds of millions of planets, and we will bring them close to the earth. The characteristics And similar celestial bodies are called heavenly bodies. Terrestrial objects are mainly distributed in the line closer to the sun