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From: moroney@world.std.spaamtrap.com (Michael Moroney)
Newsgroups: sci.physics
Subject: Re: Each dimension is a spin- 3 spins, 3 dimensions
Date: Tue, 3 Jul 2018 18:04:02 +0000 (UTC)
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Xref: csiph.com sci.physics:692527

john <johnsefton288@gmail.com> writes:

>MM
>"Part of it. Galaxies are complicated, they are not about planets orbiting
>a pointlike m"
>Yes yes.
>You do know that the stars used to obtain GRCs are at equal distances from
>the center, Michael?
>How does your idea explain this, again?

Just like Odd wrote. A spiral galaxy isn't a smooth homogeneous disk.
It's lumpy and somewhat irregular, with high density here, low density
there, more matter in the arms, less matter between the arms, etc.

(John, quit reading here, I'm about to use some bad words)

Astronomers will look at the star speeds from many parts of a galaxy,
all sides, near the center and at the edges and in between, and they
will create a gravity map from that, corresponding to the mass density
of the galaxy. They will compare that to optical/infrared/radio maps and
the difference will correspond to unseen mass, invisible d*rk m*tt*r.
They will create an actual rough map of the d*rk m*tt*r in the galaxy.
Did you ever track down a 6 year old to explain "invisible heavy stuff"
to you? Some galaxies they have found have almost no d*rk m*tt*r. In many
cases they can check for gravitational lensing to help confirm or refute
their estimates of the amount of d*rk m*tt*r.

You see, that's how real science works. Take the data, come up with a
hypothesis that could explain it, and try to verify or refute it with
more experiments/data. It is NOT "I thought it up so it must be true!"
or butt mining like you, and Plutonium, and several others here seem to 
believe.