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If space is magnetised then the stars inside a galaxy will all rotate in a uniform pattern. Have just read an article by BryanG that demonstrates that even old galaxies are magnetise as is proven by the fact that light passing through them is polarized. If this is the case then stars will be forced to rotate magnetically and the need for dark matter will disappear. See ...sorry, you cannot view external links. To see them, please
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Where is your proof that galaxies are not magnetised. All the evidence surely is that they are?
But surely the only reason that charged particles will move is if there is an electro-magnetic or electro-static force pulling them forward.
Magnetic fields are a major agent in the interstellar medium (ISM) of spiral, barred, irregular and dwarf galaxies. They contribute significantly to the total pressure which balances the ISM against gravity. They may affect the gas flows in spiral arms, around bars and in galaxy halos. Magnetic fields are essential for the onset of star formation as they enable the removal of angular momentum from the protostellar cloud during its collapse.