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1·There is an asteroid on a collision course with the Earth.

有个小行星正处于可能与地球发生碰撞的航向上。《柯林斯英汉双解大词典》

2·Scientists were debating whether an asteroid was about to hit the Earth.

科学家们在争论一颗小行星是否要撞上地球。《柯林斯英汉双解大词典》

3·The largest asteroid is Ceres, which is about a quarter the size of the moon.

最大的小行星是谷神星，其体积大约是月球的四分之一。《柯林斯英汉双解大词典》

4·In this case, the orbit of the rotating asteroid will very slowly spiral toward the sun.

在这种情况下，旋转小行星的轨道将非常缓慢地向太阳旋转。

5·An asteroid could have annihilated the USA—and I wouldn't have heard the news for hours.

一颗小行星可能已经把美国毁灭了——而我可能几个小时内都没有听说这个消息。

6·Astronomers have detected an asteroid not far from Earth, moving in the same orbit around the Sun.

天文学家在距离地球不远处发现一颗小行星，它与地球在同一轨道上围绕太阳运行。

7·This iridium anomaly offers strong support for the Alvarez hypothesis even though no asteroid itself has ever been discovered.

这一铱异常为阿尔瓦雷斯假说提供了强有力的支持，尽管小行星本身从未被发现。

8·Some scientists hypothesize that the extinction of the dinosaurs resulted from the effects of an asteroid collision with Earth.

一些科学家假定，小行星撞击地球导致了恐龙的灭绝。

9·An asteroid of this size would be expected to leave an immense crater, even if the asteroid itself was disintegrated by the impact.

这样大小的小行星即使受到冲击碎裂之后也会留下一个巨大的陨石坑。

10·Moving on through the asteroid belt we enter the realms of the gas giant planets: Jupiter, Saturn, Uranus, and Neptune, all of which dwarf the Earth.

穿过小行星带继续前进，我们进入了气体巨行星区域：木星、土星、天王星、海王星，所有这些都使地球看起来像个侏儒。

小行星

1·The largest asteroid is Ceres, which is about a quarter the size of the moon.

最大的小行星是谷神星，其体积大约是月球的四分之一。《柯林斯英汉双解大词典》

2·In this case, the orbit of the rotating asteroid will very slowly spiral toward the sun.

在这种情况下，旋转小行星的轨道将非常缓慢地向太阳旋转。

3·Some scientists hypothesize that the extinction of the dinosaurs resulted from the effects of an asteroid collision with Earth.

一些科学家假定，小行星撞击地球导致了恐龙的灭绝。

4·Skeptics have argued that a single impact would raise an asteroid's overall temperature very little and that asteroids would cool too quickly between impacts to accumulate much heat.

怀疑派认为，一次撞击只会使小行星的整体温度上升很小，而且小行星在两次撞击之间会迅速冷却，从而无法积聚大量热量。

5·Paradoxically, while the temperatures required for liquid water exist only in the inner solar system, the key building blocks of life, including water itself, occur primarily beyond the asteroid belt.

矛盾的是，虽然液态水所需的温度只存在于太阳系内部，但生命的关键组成部分，包括水本身，却主要存在于小行星带之外。

(1)asteroid belt小行星带