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。

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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。

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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。

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Such disturbance has traditionally been ascribed to the combined gravitational effect of all the stars of the earth's home galaxy, the Milky Way.

ECONOMIST: X marks the spot

Marcy and a team that includes Paul Butler of the Anglo-Australian Observatory are using the telescope to scan more than 400 stars for the characteristic "wobble" caused by the gravitational effect of planets on stars.

CNN: Astronomers spy new neighbors outside solar system

It could also cast light on the mystery of dark matter, a substance that pervades the universe in vastly larger quantities than familiar, visible matter, but whose existence can be inferred only by watching its gravitational effect on visible matter.

ECONOMIST: Particle accelerators