The faint, wide arcs or shells of NGC 474 could have been formed by a gravitational encounter with neighbor NGC 470.

NGC 470暗淡而巨大的弧圈或壳可能是与比邻星系NGC 470之间的引力碰撞形成的。

youdao

But in the Milky Way, the elements encounter interstellar gas and dust and are restrained by the strength of the galaxy's immense gravitational field.

但是，在银河系，这些元素会遇到星际气体和尘埃，受到银河系巨大重力场的强力约束。

youdao

WASP-17 likely had a close encounter with a larger planet, and the gravitational interaction acted like a slingshot to put WASP-17 on its odd course, the astronomers figure.

天文学家们估计，WAPS - 17行星有可能和一颗较大的卫星又一次近距离接触，引力相互作用就好像弹弓，将WASP - 17放入奇怪的轨迹。

youdao

This would require a pair of red dwarfs to encounter the solar system and perform an elaborate gravitational dance with it for a few thousand years.

ECONOMIST: To the ends of the earth