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From: Sam Wormley on 14 Jan 2010 00:56

Supernova winds blow galaxies into shape
http://www.sciencenews.org/view/generic/id/54015/title/Supernova_winds_blow_galaxies_into_shape
A new simulation that combines supernova winds with the mysterious
material known as cold dark matter almost perfectly accounts for the
structure of dwarf galaxies in nearby reaches of the universe.
From: YKhan on 16 Jan 2010 18:39
On Jan 15, 4:07 am, Gro...(a)JeffRelf.F-M.FM wrote:
> You ( Yousuf Khan ) asked:
> “ If the stars are pushed out by the supernova winds, then shouldn't
>   the dark matter pull the stars back toward the center again rather? ”.
>
> The gravitational pull of “dark matter” is strongest at its “surface”.
>
> I don't know about “supernovae pushing stars” but,
> at the center an ideal sphere of “dark matter”,
> there's no gravitational pull ( nor pressure )... or so “they” say.

Watching the movie of the simulation that this group showed, it's not
entirely clear where the supernovas are happening, but it looks like
they are simulating a smoke disk. I can't see supernovas clearing out
swaths out of the smoke on any noticeable scale.

Yousuf Khan
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