This kind of periodic orbit is only a phase in a comet's life.

这种周期性轨道只是彗星生命中的一个阶段。

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We are often told that technological know-how, acquired in attempting to get us into orbit, will be utilized to make life better on earth.

我们被告知，我们在努力进入空间轨道的时候所获得的技术窍门将有助于我们在地球上生活得更好。

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Even if many other stars have solar systems too, planets that happen to orbit in just the right place to support life could be pretty rare.

即使宇宙中还有很多别的恒星系，能够恰好处在足以支持生命的轨道的行星估计也寥寥无几。

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ICO's ten satellites fly about 9, 000 kilometres higher in medium-earth orbit and have a life-span of 12 years.

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But could there be intelligent life in another planetary system, in orbit around one of the 100 billion other stars in our Milky Way galaxy?

CNN: Three more homes for life in the universe?

And Pulp, who were getting noticed for wry songs about everyday life, had moved into the same London orbit as Blur, Suede and Elastica.

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