They combine with dust particles from the comet to form a huge cloud.

它们与来自彗星的尘埃颗粒结合在一起，形成了巨大的云团。

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Every so often a comet gets flung out of the Oort Cloud, a swarm of comets on the fringes of the solar system, and gets close enough to Earth for us to see it.

经常有彗星被甩出奥尔特云(在太阳系边缘的彗星群)，并靠近地球到肉眼可以观测的距离。

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The Jupiter-Saturn region would have been just the right temperature for such a comet, which is much closer to the sun than the Kuiper Belt or Oorl Cloud where most comets probably formed.

木星一土星区域有适合这种慧星存在的合适温度。 它距离太阳比古比皮带和奥尔特云都要近。 这两者是大多数慧星可能形成的地方。

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Stardust passed through a cloud of material surrounding comet Wild Two in January of two thousand four.

VOA: special.2009.09.30

Only when a comet arriving from the Oort cloud has its orbit tweaked by a close encounter with a planet does it settle into a more regular existence.

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Cheng says the comet is likely making its first visit to the inner solar system from the Oort cloud, a reservoir of hundreds of millions of comets encircling our solar system at a distance of about a light year.

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