S0 appended a clip on the Galactic Wave.
Similar to the Solar wind in speed but on a vastly larger scale. The flow is normal to the Galactic arms. 10% difference in density from the peaks to the valleys. 'Tens of light years' wide, they start out short and fast but as they spread they slow and get taller -- 200 to 525 light years tall.
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.Without freedom of speech we wouldn't know who all the idiots are. -- anonymous poster
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.Three conspiracy theorists walk into a bar --You can't say that is a coincidence.
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