Re: New analysis puts dark matter back into elliptical galaxies (Forwarded)

"John Curtis" <john@xxxxxxxxx> wrote in message
news:1129389637.633892.196980@xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
>
> Joseph Lazio wrote:

> > May I ask why you stop with the Galactocentric frame? After all, the
> > Milky Way Galaxy and the Andromeda Galaxy appear to be falling toward
> > each other. Wouldn't the appropriate frame to use be the Local Group
> > barycentric frame?
> >
> Yes, but not necessarily so. Just like the heliocentric rotation,
> galactic rotation is a visual effect, that can oly be sustained
> by the assumption of a stationary galactic center. However, a
> stationary galactic center is impossible, because the galaxy
> would crash into it. Only a moving galactic center preserves the
> integrity of a galaxy by causing the stars to crisscross
> galactic center's path, thereby falsifying galactic rotation.
> John Curtis
>

It appears to me that you've got an irrational obsession with
trying to do away with rotational motions. Angular momentum
cannot be denied, and acceleration is absolute; you cannot
define away either by choice of an inertial frame.


.

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