 Quote by haael
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.
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we can't? I thought that stellar wind drops off so steeply due to 1/r
2 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.