地球质心(简称地心)是指包括海洋大气等的整个地球的质量中心，地心运动是地球质量中心相对于地球参考框架原点的位移。
Geocenter motion is the relative displacement from the center of mass of Earth to the origin of the Terrestrial Reference Frame.
在我们地球上，重力会把我们拉向星球的质量中心，因此在平坦的地表，我们自然站得很直。
On our spherical Earth, gravity pulls "down" us toward the planet's center of mass. So on a flat surface, we naturally stand up straight.
据推算，NGC3115中心的超大质量黑洞，距地球3200万光年，质量相当于太阳质量的20亿倍。这也使它成为距地球最近的“10亿太阳质量级别”黑洞。
The supermassive black hole at the center of NGC 3115, they calculate, has a mass of about 2 billion Suns, making it the nearest billion-solar-mass black hole to Earth at 32 million light-years away.
地球轨道的明星都围绕一个共同的质量中心之间。
The planet and the star both orbit around a common centre of mass between them.
这颗行星距离地球大概153光年，质量比木星稍轻，但是它轻快敏捷的轨道距离中心恒星却比木星的近100倍。
The planet is about 153 light-years from Earth, and weighs a bit less than Jupiter. But its zippy orbit is a hundred times closer to its star than Jupiter's is.
中心土地质量：大金字塔是位于地球陆地面积的中心。
Centre of land mass: the Great Pyramid is located at the centre of the land mass of the earth.
太阳是离地球最近的一颗恒星，也是太阳的中心天体，它的质量占太阳系总质量的99.865%。
The sun is earth's nearest a star, and is also the center of the sun, it accounts for the quality of the celestial 99.865% of total quality of the solar system.
太阳是离地球最近的一颗恒星，也是太阳的中心天体，它的质量占太阳系总质量的99.865%。
The sun is earth's nearest a star, and is also the center of the sun, it accounts for the quality of the celestial 99.865% of total quality of the solar system.
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