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Galactic Wind

In the Face Book group:
The post was about a galactic wind affecting dark matter.
My comment:

What does this mean? ' strong winds can push gas and dust away from the heart of the galaxy.' Winds on earth are caused by air pressure differences. There is no such pressure in space. The vacuum of space cannot exert pressure. The stream of charged particles accelerating away from the Sun has been called the solar wind (though it is an electromagnetic phenomenon) but I suspect most do not expect the solar wind capable of pushing gas and dust despite its poorly chosen name. A solar sail uses radiation pressure, not a wind. I have heard of galactic winds but never a rational explanation for it. This galactic wind is apparently important for dark matter.

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