The Milky Way may have been shrunk down by ancient magnetic fields

Magnetic fields present in the early universe may have shrunk the volume of our galaxy by nearly 30 per cent. These fields seem to concentrate matter in the centre of galaxies, which might help explain why some black holes in such locations grow so fast.
Read more: https://www.newscientist.com/article/2244840-the-milky-way-may-have-been-shrunk-down-by-ancient-magnetic-fields/#ixzz6O8k6UwHd?source=Snapzu