The origin of the Milky Way's magnetic field is debated, with suggestions that it may not stem directly from the supermassive black hole at the galaxy's center. Instead, the activity surrounding the black hole, such as accretion and radiation, could contribute significantly to the magnetic field. Additionally, the cumulative effect of electromagnetic radiation from countless stars throughout the galaxy likely generates a broader magnetic field. The cosmic microwave background is noted as a weak external source of electromagnetic radiation but does not significantly influence the galaxy's magnetic field. Overall, the interplay of various stellar activities appears to be a key factor in the formation of the Milky Way's magnetic field.
