Dark matter gives out no light and is detectable only because of its gravitational effect on visible matter.
暗物质不发光，它之所以能被发现，只是因为它对可见物质产生引力作用。
Technically, Neptune's existence was mathematically predicted years earlier, based on the gravitational effect the ice giant planet was having on neighboring Uranus.
从学术上来说，更早之前，基于这颗巨大的冰球对邻近的天王星的引力作用，人们就已经精确地预测到海王星的存在。
Much indirect evidence for dark matter — supposedly 25 percent of the mass in the universe — comes from observing its invisible gravitational effect on visible galaxies and their stars.
据推测不可见的暗物质占到宇宙总质量的25%，其存在的间接证据主要是由于观察到其施加在星系和恒星上的引力作用。
Cometary accurate orbital motion is a complex and difficult problem. Its remarkable characteristic is the presence of the non-gravitational effect.
彗星的准确轨道运动的确定是个复杂而困难的问题，其显著特点是存在非引力效应。
Scientists have so far been unable to directly observe dark matter, and have only been able to detect it by measuring its gravitational effect on light.
到目前为止，科学家们还不能够直接观察到暗物质，他们只有通过观测对光线所造成的引力影响，才能够发觉暗物质的存在。
To reduce the gravitational effect in the microgravity experiment on ground, the character sizes of objects that are researched are generally very little.
微重力科学研究的地面模拟实验为了尽量减小重力的影响，通常要求被研究的对象特征尺度较小。
By means of the metric for the celestial body with electric-magnetic charge, magnetic momentum and quadrupole moment, some gravitational effect are studied.
本文利用具有电（磁）荷、磁矩和质量四极矩引力场方程的解，讨论了具有电（磁）荷、磁矩和质量四极矩天体的某些引力效应。
Gravitational effect is an important content in astrophysics and astronomy.
引力效应是天体物理学和天文学中非常重要的一个内容。
Gravitational effect is an important content in astrophysics and astronomy.
引力效应是天体物理学和天文学中非常重要的一个内容。
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