Re: Is the Sun mostly dark matter ?

On Mar 14, 12:35 pm, Bob Remeaux <B...@xxxxxxxxxxx> wrote:
john wrote:
On Mar 13, 5:18 pm, Bob Remeaux <B...@xxxxxxxxxxx> wrote:

GatherNoMoss wrote:

On Mar 13, 1:36 pm, Uncle Al <Uncle...@xxxxxxxxxxxxx> wrote:

Observed gravitation vs. core reaction rate re neutrino emission.

Yes.

But WHY ?

Why isn't dark matter and normal matter all mixed.

Why ever would there be seperation ?

Matter in a gravitational field has gravitational potential energy (PE)
and kinetic energy (KE). As the matter moves in response to the
gravitational field, energy is converted between the two. As matter
falls towards the centre its gravitational PE decreases and its KE
increases. Having passed the centre of mass, it KE is converted back to
gravitational PE.

For ordinary matter, the effect of the electromagnetric force means that
atoms can affect each other when they collide - electrons apply the EM
force on each other, giving each other energy which can then be radiated
away.

Dark Matter on the other hand (like neutrinos) does not appear to be
affected by the EM force, so there is not the same method for energy to
be lost.

Consider a large (galaxy sized) cloud of mixed ordinary and dark matter.
both types of matter will be attraced by gravity to accelerate towarde
the centre, but although the ordinary matter will collide, lose energy
and collect at the centre; the dark matter will be unable to lose energy
and will thus remain distributed more evenly through the full extent of
the original volume.

Hence the separation.

There is dark matter in the Sun, but the density of dark matter within
the sun is not so much greater than the density across the solar system
as a whole. This is in contrast to ordinary matter, where the sun
represents the overwhelming majority of the mass of the solar system.

Maybe you are too young to remember this,
but dark matter was first proposed- as a joke!- to explain
why outer stars in galaxies moved faster than they should.
Someone said; 'maybe there is an invisible gravitationally-attractive
something around each galaxy in exactly the right shape (a torus?)
to accelerate outer stars faster'- or words to that effect.

Or maybe you misunderstood what was said - or you misremember!

So you need your DM to be in the right place!
If you mix it up with the other stuff,
the original reason for its existence is gone!
You need it to pull outer stars around!!!!
Why all of a sudden is this no longer an issue?!!!!!

Try explaining what you want to explain.

It's usually a mistake to try and paraphrase an argument that you
disagree with.


The DM was proposed to explain why rotation rates for outer stars in
galaxies do not agree with our theory of gravity. In order to do so,
the DM has to be
in certain configuration wrt those galaxies.
It *has to be* further from the center than the stars- or it will
do the opposite and actually slow the stars.
So it *can't* be falling through the center.
It *has to* remain *further* from the center than the
outermost stars.

It was INVENTED to explain why the galaxy doesn't obey the law of
gravity.

Explain.

John
.

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