Forget nuclear warheads to stop a crash with a comet that could have cataclysmic effects such as the one that is believed to have triggered the demise of the dinosaurs, Hermann Burchard of Oklahoma State University told New Scientist magazine.

• 俄克拉荷马州立大学的赫尔曼-伯恰德对《新科学家》杂志说，别想用核弹头去阻止同彗星的碰撞，那样做的后果会跟据信使恐龙绝灭的那次灾难差不多。