From a cosmic perspective, the impact of Comet Shoemaker-Levy 9 into Jupiter was unremarkable: the cratered surfaces of rocky planetary bodies and satellites already bear testimony that the solar system is a shooting gallery.

• 从宇宙的观点，修梅克?李维9号彗星撞击木星是件小事：岩石态行星与卫星凹凸不平的表面，早已说明了太阳系就像个靶场。