广义而言,地球化学的范围包括天然环境化学的各个方面。新近又增加了恒星和太阳系(特别是地球)化学元素的成因、行星表面和大气的成因,以及生命起源条件等方面的课题。 宇宙化学是地球化学的一个分枝。从理论上说,它的范围不限于太阳系,但其主要观测对象为太阳系的各个成员,即行星及其卫星、慧星、陨石和太阳。太阳光谱分析最直接地给出了太阳化学组成的资料。慧星尾部发射的光谱可以作出关于它们化学组成的结 In a broad sense, the scope of geochemistry includes all aspects of natural environmental chemistry. Recently, the causes of the chemical elements of stars and solar systems (especially the earth), the genesis of planetary surfaces and the atmosphere, and the conditions of the origin of life have also been increased. Cosmic chemistry is a branch of geochemistry. In theory, its scope is not limited to the solar system, but its main object of observation is the members of the solar system, the planets and their moons, comets, meteorites and the sun. Solar spectrum analysis most directly gives information on the chemical composition of the sun. The spectrum emitted by the tail of a comet can make a knot about their chemical composition