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It appears that the relativistic jets from some galaxies have maintained a fairly straight path for thousands of years, until they run into the intergalactic medium and slow down.Some also exhibit sudden symmetrical kinks, which may be due to black hole mergers(?)Electrons spiral around the magnetic field lines in the jets, emitting polarised light. It is thought that the magnetic field lines themselves may be twisted into a spiral. However, at this time we can't observe a black hole close enough to make detailed observations.Some images (But you have to separate the artists renditions from actual astronomical observations)