1.
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。
2.
Water flowed only briefly in the past, they posit, when asteroids crashing into Mars billions of years ago unleashed scalding rains for decades at a time.
数十亿年前小行星撞击火星，造成为期数十年的滚烫大雨，火星仅在此小段时间曾经有水流动。
3.
This station's planet experts also attended many international scientific seminars on the dangers of comets and asteroids colliding with Earth.
该台行星专家还多次参加关于彗星、小行星撞击地球危险性的国际学术讨论会。
4.
Alvarez proposed that an asteroid estimated at over 1 00km in width struck the earth off the coast of the modem day Yucatan peninsula.
阿尔瓦雷茨提出一颗直径约100千米的小行星撞击了现在的尤卡坦半岛。
5.
The only remaining viable alternative is the heat produced when asteroids collide with one another.
剩下唯一的选择，是小行星彼此撞击产生的热。
6.
Small meteorites have left impact craters all over the planet’s surface.
这个行星的表面布满了小块陨石留下的撞击坑。
7.
First, a single impact cannot raise the global temperature of an asteroid-size body by more than a few degrees.
首先，单一撞击无法使小行星般大小的天体整体温度提升几度。
8.
Thus, astronomers can determine an asteroid's orbit sooner, predicting whether it will hit the Earth or not.
这样天文学家才能尽快确定小行星的轨道，预测它是否会撞击地球。
9.
Many physicists suspect the Earth suffered a direct hit from an asteroid or that a comet could be to blame for the extinction.
许多物理学家推测，造成恐龙灭绝的原因可能是当时地球遭到一颗小行星或彗星的撞击。
10.
when the asteroid impacted near today's Gulf of Mexico shoreline at a speed of 33,750 mph.
当小行星以每小时33,750 英里的速度撞击今天的墨西哥湾海岸线附近时
11.
Meteoroids or other space rocks smashed into the newly-forming planets and moons.
陨石或者其它太空岩石猛裂撞击形成不久的行星和卫星。
12.
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.
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。
13.
When planets are bombarded by asteroids or comets,
当星球被陨石或彗星连续撞击时，
14.
China Builds Up Jupiter Comet Collision Observation Network
中国建立彗星撞击木星观测网
15.
In July 1994, the Comet Shoemaker -Levy collided with Jupiter.
1994年7月，慧星“皮鞋匠”——利维撞击了木星。
16.
It's very unlikely that an asteroid will crash into Earth but the danger exists.
小行星撞地球的可能性很小,但依然存在这样的危险.
17.
When the impact happened, the dark matter in the clusters also collided.
当撞击发生时，星团中的暗物质也发生碰撞。
18.
Another way, in which life could fail to develop to an intelligent stage, would be if an asteroid or comet were to collide with the planet.
从另一方面考虑，生命未能发展到具有智能的阶段，是否可能是小行星或彗星与行星发生了碰撞。