2005/03/11 | 反螺旋定理[Anti-Spiral Theorem]
类别(¤〖天文〗) | 评论(0) | 阅读(63) | 发表于 14:16
If a steady state solution of a time-reversible set of equations has the form of a trailing spiral, then there must be an identical solution in the form of a leading spiral. However: most observed spirals in galaxies are trailing!
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