What disturbs them Perhaps stars passing nearby, or passing nebulae, or collisions. Perhaps some of the objects are large enough to disturb smaller ones gravitationally.

• 是甚麽干扰它们或许是一些星球靠近到太阳系；或是一个星云；或是彼此的碰撞；或许当中有一些大到能够因万有引力而干扰到比较小的.