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I Really Do Not Understand This.

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Posted by Alexander on January 17, 2002 22:43:54 UTC

Galaxies are different than particles - they consist of more particles. Interparticle interaction makes them behave the way they (galaxies) do. So, how can we use, say SO(3) symmetry of rotations in 3 dimensions (which is good for elementary particle because we assume that the particle is symmetric in all directions) for a galaxy? Galaxies are different - some indeed are spherically symmetric, but most not. We may ASSUME that they are all spherically symmetric or are cylindrically symmetric, and get some number out of this assumption, but this number will match the reality only as good as our original assumption does.

So, I do not know what exactly you mean by asking why can't we use method 2 for galaxies. We can. But what are original "axioms" to start with?

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