Re: Is the Sun mostly dark matter ?

On Mar 16, 7:01 pm, Sam Wormley <sworml...@xxxxxxxxx> wrote:
This is precisely the problem with Dark Matter! First you have to
explain that somehow DM doesn't interact with either itself or with
Regular Matter other than through gravity. If it starts falling into a
star's gravity well, it will just slingshot out again since there is no
force there to brake it.

Why would dark matter fall in as opposed to following an keplarian
orbit?

This is a corollary to my original question. Even if it doesn't just
fall into a gravity well and stay there, then why doesn't it just
orbit around gravity wells? It should be able to orbit around all
kinds of gravity wells with equal probability. Presumably when DM was
made in the Big Bang, DM must have come out with all kinds of energy
levels, some travelling fast, and some slow. Some of the DM must be
moving slow enough that it can be captured in orbit around stars and
planets too, but apparently DM only comes out in high-speed versions
that can only be captured in orbit by the gravity of galaxies.

Also why doesn't DM congregate around intergalactic gas? There is
apparently enough of this gas around to create billions more galaxies,
yet the Bullet Cluster collision clearly shows that DM doesn't get
attracted to the gas, just to the galaxies. This despite the fact that
the gas outweighs all of the galaxies by several fold in that
collision.

That's why I find the whole idea of Dark Fluid so much better than
Dark Energy and Dark Matter. DF appears to become either of these
things, depending on the concentration of matter in a particular
region of space, and the local energy concentration.

Yousuf Khan
.

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