大多数的小行星都是由碎石组成,而这些碎石靠着自身之间微弱的万有引力结合在一起.
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How can the comets , asteroids and meteorites , which fascinate us , kill us?
随着太阳的不断扩张, 太阳系中其它的星球将发生怎样的变化?
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En route to Jupiter, the craft took the first detailed images of two asteroids.
在到木星的途中, 宇宙飞船首度传回两小行星清晰的照片.
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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.
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But there are also thousands of asteroids whose orbits put them a collision course with Earth.
但是也有成千上万颗小行星的轨道把它们引上与地球碰撞的方向.
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