What happens to the collapsing core?
	• Neutron star (more in next chapter) – Quantum rules also resist neutron packing • Densities much higher than white dwarfs allowed – R ~ 5 km       ~ 1014 gm/cm3   (similar to nucleus) • M limit uncertain,  ~3 MSun before it collapses – Spins very fast (by conservation of angular momentum) – Trapped spinning magnetic field makes it: • Act like a “lighthouse” beaming out E-M radiation (radio, light) – pulsars • Accelerates nearby charged particles