When a star between 9-25 solar masses reaches the end of its life, fusion in the core halts and the core can no longer withstand gravitational pressure. Gravity causes the ~2.5 solar mass core to collapse, triggering a supernova. In this process, the roughly Earth-sized core (6392 km) will collapse down into a neutron star the size of a small city, about 9.1 km. If the star had a rotation period of 189 s before collapse and a negligible amount of mass was lost from this core in the supernova, what is the neutron star's new rotation period? 0.038 How many times per second does the neutron star rotate? 26.32 x rev/s *N.b.: neutron stars don't emit light themselves (weird that they're called 'stars' at all), so they were first discovered via radio emission as their magnetic fields interact with nearby particles. The first pulsar discovered was nicknamed LGM-1 by researchers, for Little Green Men.