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Show us your evidence for that.
Nope. I showed you twice that they aren't. One more time...
The quasi-stationary density wave theory can be tested by measuring this quantity and showing that it does not vary with radius in the galaxy. Unfortunately, this measurement is difficult because Op is only indirectly connected to observables such as the stellar rotation speed. Here, we use the detailed information on stellar populations of the grand-design spiral galaxy UGC 3825, extracted from spectral mapping, to measure the offset between young stars of a known age and the spiral arm in which they formed, allowing the first direct measure of Op at a range of radii. The offset in this galaxy is found to be as expected for a pattern speed that varies little with radius, indicating consistency with a quasi-stationary density wave, and lending credence to this new method.
Everyone can see how they tested their hypotheses. And notice that results of the tests confirm the hypotheses. No point in denying it.
Cannot prove a negative. There is no evidence other than in teh fertile imaginations of some scientists that there are other universes around!
And this evolutionist says the core spins faster than the arms!
Cosmic Soufflé: The Tricky Art of Spiral Galaxies
He is peer reviewed and published as well! so I guess on your side you can just choose which hypothesis you wish to believe!
Just like it was with biological evolution before they drove other ideas out.
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