Triton will one day enter within Neptune's Roche limit and become totally obliterated.

崔顿将缓慢地经螺旋轨道接近海王星，而当它到达洛希极限时最终将被海王星的引力撕成碎片。

Because the moon was orbiting at just the right distance from Saturn when it shattered - within the so-called Roche limit - the tiny pieces formed the rings instead of dispersing.

因为哪一个月亮当时刚好运行到土星引力最弱的一段距离——处于所谓的“洛希极限”——撞击留下的小碎片没有消失而是形成了土星的光环。