The Milky Way may have been shrunk down by ancient magnetic fields
Magnetic fields in the early universe may have shrunk the volume of our galaxy by close to 30 per cent. The compression that causes this shrinking could concentrate a galaxy’s matter in the centre where black holes are often found – which may also help explain why certain black holes can grow so fast.
Sergio Martin-Alvarez at the University of Cambridge in the UK, and his colleagues simulated the effects of these little …