The probes have been measuring subtle variations in the Moon's gravityfield.
这两辆探测仪在月球重力环境中发生了微妙变化。
2
The aurora display was not caused by the continuing magnetic blasts from Planet X, as auroras are caused by fluctuations in Earth gravityfield.
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。
3
The mission consists of twinspacecraft that will enter tandem orbits around the Moon for severalmonths to measure the gravityfield in unprecedented detail.