Wow, thank you! This made my day: "Consider the possibility that introducing an arbitrarily small tame asteroid could throw a planet out of the solar system. Th

Wow, thank you! This made my day: "Consider the possibility that introducing an arbitrarily small tame asteroid could throw a planet out of the solar system. This would be a different kind of instability than those that have been so far considered. It would be of mathematical interest to prove that a system consisting of a sun and three planets could be disrupted by a single arbitrarily small tame asteroid."