地球、太阳、银河系、河外星系都是有着不同质量的天体。根据牛顿的万有引力定律,因此它们彼此都应该存在着牵引力。所以,对于每一个天体来说都有来自四面八方的牵引力。因为所有天体所处的位置都是各个方向牵引力的平衡点,所以它们都能够拥有各自的 The Earth, the Sun, the Milky Way, and the Extragalactic Galaxy all have celestial bodies of different qualities. According to Newton’s law of universal gravitation, they should each have traction. Therefore, for every celestial body has traction from all directions. Because all the celestial bodies are in the same position as the balance of traction in all directions, they all have their own