Stable or not, HD 131399a is fascinating to astronomers in part because it helps fill in gaps in our knowledge of how planets form and change orbit.

无论稳定与否，HD 131399 A星系对天文学家们有着巨大的吸引力，一部分是因为它的发现填补了我们现有知识的一处空白，即行星如何形成以及如何变动轨道。

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There are several ways to change an asteroid's orbit, the simplest of which is to run a spacecraft into the hurtling rock.

改变小行星轨道的方法有好几个，最简单易行的方法就是让一架宇宙飞船和这个大石头玉石俱焚。

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However, if a star with planets captures another one, then one of its existing planets must change its orbit, and this could make the system unstable.

然而，假如一颗已有行星伴随的恒星再要捕获另一颗行星，那么已有行星中的一颗便会改变它的轨道，而这样的结果将会导致系统不稳定。

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The debris could shatter into more pieces or change orbit and be on a collision course with something else.

CNN: STORY HIGHLIGHTS

This would involve launching a spacecraft able to give the asteroid a nudge to change its orbit.

BBC: Foresight mission spacecraft Image

Although the predicted distance between the debris and the satellite seemed to preclude a collision, the fact that the close approach happened within 10 seconds of the change in orbit made the Feng Yun 1C debris the likely culprit, Kelso wrote in a blog post.

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