太阳系形成于一个巨大的旋转星云——太阳系星云，星云中含有大量的星际残骸。
Our solar system arose from a large, rotating cloud of interstellar debris called the solar nebula.
但是一些颗粒是来自于凝成太阳系的原始星云。
But a few grains have survived from the primitive nebula that the solar system condensed from.
通常来说，彗星来自距离遥远且冰天雪地的柯伊伯带和奥尔特星云然后掉入太阳系中的内层区域。
Normal comets fall into the inner regions of the solar system from icy reservoirs in the distant Kuiper belt and Oort cloud.
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