它的摆动取决于重力场的力。
According to one hypothesis, the planet's gravitational field tugs on the protoplanetary disk of dust and gas from which it formed.根据一种假设,这颗行星的重力场会对由尘埃和气体组成的原行星盘产生牵引力。
Once Earth had gone through the final stages of its formation, gases bubbled to the surface and were held by Earth's gravitational field to form the atmosphere.一旦地球经历了其形成的最后阶段,气体就会鼓泡到地表,并被地球的重力场控制,形成大气。