Another way, in which life could fail to develop to an intelligent stage, would be if an asteroid or comet were to collide with the planet.
Another way, in which life could fail to develop to an intelligent stage, would be if an asteroid or comet were to collide with the planet.
从另一方面考虑，生命未能发展到具有智能的阶段，是否可能是小行星或彗星与行星发生了碰撞。