Jan Panteltje <alien@comet.invalid> wrote or quoted:What are the effects of magnetic field lines on star formation in
galaxies?
These natural magnetic fields in galaxies and their gradients,
I think, are relatively weak. Over long timescales and over larger
spatial regions, their effects can accumulate and become noticeable.
But to drive a spacecraft, you'd need fields that are fairly strong
at the location of the ship and at the moment the ship is there.
You also need a large _gradient_ of magnetic field. (Unless you have a
supply of magnetic monopoles :-))
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