It is a space rock captured and now held in orbit by the gravity force of Mars.
它只是星际空间的一块岩体，受火星引力作用而被吸引住，并沿着轨道环绕火星运动。
Newton proved his idea by measuring how much gravity force would be needed to keep the moon orbiting the Earth. Then he measured the mass of the Earth and the moon, and the distance between them.
牛顿要通过测量月球按轨道围绕地球运转需要多大的力量，来证明他的理论，于是，他测量月球和地球的质量，以及他们之间的距离。
Newton proved his idea by measuring how much gravity force would be needed to keep the moon orbiting the Earth. Then he measured the mass of the Earth and the moon, and the distance between them.
牛顿要通过测量月球按轨道围绕地球运转需要多大的力量，来证明他的理论，于是，他测量月球和地球的质量，以及他们之间的距离。
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