The study of pulsars provides insights into the nature of compact objects from "summary" of The Science of Interstellar by Kip Thorne
Pulsars are rapidly rotating neutron stars that emit beams of electromagnetic radiation from their magnetic poles. These beams sweep across space like a lighthouse beacon, producing regular pulses of radiation that can be detected by telescopes on Earth. By studying these pulses, scientists can learn valuable information about the nature of compact objects such as neutron stars and black holes.
Neutron stars are the remnants of massive stars that have undergone supernova explosions. They are incredibly dense, with a mass greater than that of the Sun packed into a sphere only a few kilometers in diameter. This extreme density causes the protons and electrons in the star to merge into neutrons, hence the name "neutron star." Pulsars are a subset of neutron stars that emit beams of radiation as they spin rapidly on their axes.
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