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Old 12-31-2019, 05:39 AM   #8058 (permalink)
freebeard
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Then how come a solar storm was blamed for knocking out power to part of Canada and the North east united States in 1989?
That would be the induction.
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There's one more miracle particle search that ends this year and has found nothing thus far.
It turns out that 'dark matter' is just regular matter that's so diffuse we see right through it. Our sensors are getting better. And the galactic arms that are rotating too fast (to require 'dark matter') are an illusion.

Density Wave Theory.
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Originally, astronomers had the idea that the arms of a spiral galaxy were material. However, if this were the case, then the arms would become more and more tightly wound, since the matter nearer to the center of the galaxy rotates faster than the matter at the edge of the galaxy.[6] The arms would become indistinguishable from the rest of the galaxy after only a few orbits. This is called the winding problem.[7]

Lin and Shu proposed in 1964 that the arms were not material in nature, but instead made up of areas of greater density, similar to a traffic jam on a highway.
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