2005/05/21 | 卷绕问题[Winding Problem]
类别(¤〖天文〗) | 评论(0) | 阅读(51) | 发表于 20:39
If the material originally making up a spiral arm of a spiral galaxy remains in the arm, then the differential rotation of the galaxy should wind up the arm in a time which is short compared to the age of the galaxy.
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