Neutron Star

Not a star per se, but really another type of stellar corpse. Neutron stars are created following the death of stars that much larger than the sun. During the collapse, the electrons and protons in the soup of material are fused through inverse beta decay, forming neutrons in the end.

Neutron stars are about the densest objects there are in the Universe, almost as dense as an atomic nucleus. They have a mass between 1.4 and 3 solar masses, but are only about 20km in diameter. Neutrons stars also have powerful magnetic fields that induces powerful beams of radiation around its magnetic pole. When oriented in the direction towards Earth, we observe these regular pulses of radiation as the neutron star spins about its axis. These kind of neutron stars are also known as pulsars.