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本文主要研究天体的轨道与能量的关系,系统的机械能E为系统的万有引力势能与各天体的动能之和。仅有一个天体运动时,则E为系统的万有引力势能与其动能之和。由于没有其他外力作用,系统万有引力属于保守力,故机械能守恒。
This paper mainly studies the relationship between orbit and energy of a celestial body. The mechanical energy E of the system is the sum of the gravitational potential energy of the system and the kinetic energy of each celestial body. When there is only one celestial body motion, then E is the sum of the gravitational potential of the system and its kinetic energy. Because there is no other external force, the system of gravity is a conservative, so mechanical energy conservation.