An international team of astronomers using Hubble have been able to study stellar evolution in real time. Over a period of 30 years dramatic increases in the temperature of the star SAO 244567 have been observed. Now the star is.
Artist\'s impression of neutron star. Neutron stars are formed when large stars run out of fuel and collapse. To get a neutron star, you need to have star that’s larger than about solar masses and less than 5 times the mass of the Sun.