烈火焚城，灰烬满天，昔日繁华化作梦幻。大学生一级一片第一次

　　An asteroid much larger than that which caused the Chicxulub Crater is attacked by a ten-megaton nuclear warhead minutes before its collision with Earth, breaking it into three pieces, the largest of which bounces off the Earth's atmosphere. This "substantially changes the Earth's orbit", due to the amount of energy released by the asteroid piece (the size of Iceland) bouncing ... (展开全部)