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Mar1-12, 02:16 PM
P: 614
Quote Quote by haael View Post
Terrifying picture :).

But isn't it that the large-scale galaxy structure depends on something more than gravity? I.e. the spiral arms are somehow stabilized by supernova explosions. We can't also deny the solar wind pressure in large scale.
we can't? I thought that stellar wind drops off so steeply due to 1/r2 that compared to the distances between stars, it would be irrelevant. Or at least I've never heard any of my professors bring this up as an important concept, nor have I read of stellar wind pressure being important on galactic scales.

I may just be wrong though, I'm not a part of the astrophysics community so it is very likely that I could be unaware of that kind of idea.