you mean spiral patterns? Spiral patterns are

来源: 9$ 于 2012-10-14 08:04:29 [] [博客] [旧帖] [给我悄悄话] 阅读数 : (136 bytes)

the disturbance to rational body structure.

see: Google search:   Rational Galaxy Structure and its Disturbance

请您先登陆，再发跟帖！