The aurora display was not caused by the continuing magnetic blasts from Planet X, as auroras are caused by fluctuations in Earth gravity field.
极光的出现并不是来自于X星的持续的磁场轰炸引起的，因为极光是由地球重力场的波动引起的。
From the definition for the magnetic acceleration, the ideal magnetic field model and the magnetic field intensity profile needed for creating the micro-gravity environment are presented.
由磁加速度的定义出发，提出了理想磁场模型和实现微重力环境所要求的磁场强度分布。
Measurements of the magnetic and gravity field of the earth are used extensively to explore its structure, particularly in the search for gold, oil, diamonds and other substances of economic value.
地球磁场和重力场的测量广泛用于研究地质构造，尤其是寻找矿产、石油、黄金及其它有经济价值的物质。
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