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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 http://dunlap.utoronto.ca/~bgaensler/papers/stories/301Gaensler-3.pdf
Where is your proof that galaxies are not magnetised. All the evidence surely is that they are?
Magnetized: to make magnetic.
Dark matter is a hypothetical kind of matter that cannot be seen with telescopes but would account for most of the matter in the universe.....Structure formation (https://en.wikipedia.org/wiki/Dark_matter#Structure_formation)Dark matter is crucial to the Big Bang model of cosmology as a component which corresponds directly to measurements of the parameters associated with Friedmann cosmology solutions to general relativity. In particular, measurements of the cosmic microwave background anisotropies correspond to a cosmology where much of the matter interacts with photons more weakly than the known forces that couple light interactions to baryonic matter. Likewise, a significant amount of non-baryonic, cold matter is necessary to explain the large-scale structure of the universe.
But surely the only reason that charged particles will move is if there is an electro-magnetic or electro-static force pulling them forward.
The first law states that if the net force (the vector sum of all forces acting on an object) is zero, then the velocity of the object is constant.
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.