But the larger envelope of circumstellar dust extends some 60 billion kilometers into space, equivalent to about 400 times the Earth-Sun distance.
但是拱星四周星尘更大的外壳可以向宇宙延伸600多亿公里，相当于地球到太阳距离的400倍。
But the larger envelope of circumstellar dust extends some 60 billion kilometers into space, equivalent to about 400 times the Earth-Sun distance.
但是拱星四周星尘更大的外壳可以向宇宙延伸600多亿公里，相当于地球到太阳距离的400倍。
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