According to DailyGalaxy.com it will take an asteroid bigger than 12miles in diameter to destroy all plant and animal life.
根据天王网站DailyGalaxy.com的报道,只需一颗直径在12英里或者更大一点的小型便能使得地球上的所有植物和动物遭遇毁灭性的袭击。
Such an asteroid is thought to have been responsible for the extinction of the dinosaurs 65million years ago - a rock up to 10miles in diameter hit Earth at 25,000 an hour with a force of 100 megatons, the equivalent of one Hiroshima bomb for everyone on the planet.
“人们也认为,这样的小行星与6500万年前恐龙的灭绝有关,有一块直径10英里的小行星以每秒每小时2500英里的速度撞击地球,释放了100兆的能量,这相当于投放与地球人口总数相同的广岛原子弹。”
Earth has avoided such an event since in part because of Jupiter’s gravitational field which limits our exposure to space rocks
地球之所以避开了这样的危险,是因为木星引力场的作用,使得地球并不是完全“暴露”在太空岩石的危险之中。
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