The bad news is that forecasting asteroid impacts remains a tricky business.
坏消息是预测小行星撞击不是件容易事。
Astronomers have yet to witness an asteroid impacts with another planet.
天文学家还没有目击过小行星撞击其它行星。
Once the sun and planets took shape, heat became readily available in the form of solar radiation, asteroid impacts, and gravitational pressure.
太阳和行星成形后，太阳辐射、小行星撞击以及重力压力继续提供着热量。
If you happen to live in fear of asteroids, then here's a sobering fact for you: Our planet absorbs asteroid impacts like a truck grille eats bugs.
如果你在为小行星会不会撞击地球而忧心忡忡，那么你应当清楚这样一个事实：由于地球引力而引发的小行星撞击，就好比飞驰的卡车，车头前面的格栅总是在不断吞噬着迎面扑来的飞虫。
On top of that, NASA's charter has also been changed explicitly to include a responsibility to provide advance warning of potentially damaging asteroid impacts.
另外，美国宇航局的授权也准确地随之而变，其中包括了提供对具有潜在破坏性的行星撞击预警的职责。
What's more, studies of Jupiter suggest that outer gas giants can act as gravitational shields, protecting inner rocky worlds-and any life-forms on them-from frequent asteroid impacts.
此外，对木星的研究表明，外层的气态巨行星能充当盾牌的作用，保护内部岩态行星——和行星上的任何生命形态——免遭频繁光顾的小行星撞击。
The previous five mass extinctions happened well before mankind existed and are believed to have been mainly caused by natural disasters, such as asteroid impacts and volcanic eruptions.
之前的五次大规模物种灭绝发生在人类出现之前，而且这些灭绝被认为主要是由自然灾害引起的，如小行星撞击和火山喷发。
An asteroid impact is famously responsible for the extinction of the dinosaurs 65 million years ago, but large comet impacts may be equally deadly.
众所周知，6千5百万年前一颗小行星的撞击导致了恐龙的灭绝，然而一颗大彗星的撞击可能是同样致命的。
An asteroid impact is famously responsible for the extinction of the dinosaurs 65 million years ago, but large comet impacts may be equally deadly.
众所周知，6千5百万年前一颗小行星的撞击导致了恐龙的灭绝，然而一颗大彗星的撞击可能是同样致命的。
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