The faint, wide arcs or shells of NGC 474 could have been formed by a gravitationalencounter 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。
2
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。
3
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.