我观察到彗星撞击地球！
一颗看不见的伴星，绰号“复仇者(Nemesis)，可能会导致彗星撞击地球。”
An unseen companion star, nicknamed "Nemesis," may be sending comets towards Earth.
科学家们利用美国宇航局可回收的“深度撞击”彗星探测器的母船，来观测地球、月球和火星的反射光。
Scientists used the mothership of NASA's recycled Deep Impact comet probe to look at light reflected off Earth, the moon and Mars.
由于彗星主要是由冻结的水和气体组成的冰，撞击地球的彗星将会蒸发。
Because comets are largely ice made up of frozen water and gases, a comet striking Earth then would have vaporized.
许多科学家认为，地球遭受小行星或彗星的直接撞击可能是恐龙灭绝的原因。
Many scientists believe the Earth suffered a direct hit from an asteroid or that a comet could be to blame for the extinction.
虽然天体撞击的毁灭性不容置疑，但是没有证据表明彗星导致了地球物种周期性的大灭绝。
While there’s little doubt about the destructive power of cosmic impacts, there is no evidence that comets have periodically caused mass extinctions on our planet.
普兰塔莫看起来很喜欢做关于彗星的预言，预测1872年普兰塔莫彗星将会在1873年8月12号和地球撞击。
It seems Plantamour was fond of making predictions involving comets, predicting in 1872 that Plantamour's comet would collide with Earth on August 12, 1873.
这时，她才弄明白一颗拖着长尾巴的巨大彗星就要撞击木星，并将把地球撞得粉碎。
So that's how she learnt that a great star with a long tail was going to crash against Jupiter, and shatter the earth into little fragments.
多国科学家组成的科研小组将对墨西哥尤卡坦半岛著名的“奇科苏卢布”陨石坑进行声波探测，而这个巨大的陨石坑可能就是6500万年前造成恐龙灭绝的根本原因。 科学家们希望通过这一研究能找到当时彗星或小行星撞击地球的更多的有用信息。
Scientists working off the Yucatan Peninsula are preparing to use sound waves to search for information about an asteroid that may have wiped out the dinosaurs 65 million years ago.
在地球的最初岁月中，它曾被成千上万个这样的彗星撞击。
In Earth's formative years, it was hit by thousands of comets like this.
没有任何小行星或彗星真的被预言会撞击地球。
然而进一步的说，人类对于地球的影响，完全相当于白垩纪的彗星撞击。
Yet, upon further reflection, human impact on the planet is a direct analogue of the Cretaceous cometary collision.
现在主流的学者认为，地球上的水来自彗星撞击后的沉淀物。
Until rather recently, the prevailing wisdom has been that Earth's water supply was primarily deposited by comets.
在地球上，所有数十亿年前被小行星和彗星撞击的痕迹，几乎都已经被地球表面的地质活动所抹去。
Nearly all traces of the asteroids and comets that struck Earth billions of years ago have been erased from our planet's geologically active surface.
他的团队计算了小行星和彗星撞击会在地球和月球留下的铱的含量，并作了对比。
His team calculated the amount of iridium that asteroids would leave on the Earth and moon compared to comets.
众多撞击留下的深坑让我们的地球和月球表面坑坑洼洼，他们在向我们揭示，太阳系可能是个射击场，小星星和彗星像横飞的子弹一样不断地撞击着行星和他们的卫星。
The many impact craters that have and Earth reveal our solar system can be like a shooting gallery, with asteroids and comets regularly striking planets and their companions.
众多撞击留下的深坑让我们的地球和月球表面坑坑洼洼，他们在向我们揭示，太阳系可能是个射击场，小星星和彗星像横飞的子弹一样不断地撞击着行星和他们的卫星。
The many impact craters that have and Earth reveal our solar system can be like a shooting gallery, with asteroids and comets regularly striking planets and their companions.
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