Using Newton's formula for gravity, astronomers have detected previously unknown stars and planets, including Neptune and Pluto, from the effect of their gravity on other space objects.

l利用牛顿的引力计算公式，天文学家发现了许多过去不知道的恒星和行星，其中包括海王星和冥王星。这是根据它们对其他太空物体的引力作用测算出来的。

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The variable density multilayered crustal model is put forward according to the idea of model decompose in this paper, and the corresponding gravity forward formula is deduced.

根据模型分解的思想，采用变密度多层地壳密度模型，据此推导了相应的重力异常正演计算公式。

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Results indicate that the symbolic operation wais a helpful efficiency-amplifier for satellite gravity research that was characterized by a complicated formula system.

实验结果表明，计算机符号运算对于公式体系繁杂的卫星重力学理论研究来说具有极大的增效作用。

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So，the point is,every object falling under gravity is given by the same formula, but there are many, many objects that can have many histories, all falling under gravity, and what's different from one object and the other object is, when was it dropped, from what height, and with what initial speed.

关键是,每一个受重力作用下落的物体,都有同样的表达式,但是各个受重力作用下落的物体,都有不同的初始条件,所以它们的区别在于,下落时刻,下落高度和初始速度

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