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Overview
A neutron star is the collapsed core of a massive star that remains after a supernova. It contains more mass than the Sun compressed into a city-sized object, making it one of the densest forms of matter known outside black holes.
Formation
Neutron stars form when massive stars collapse and protons and electrons combine under extreme pressure to form neutron-rich matter.
Extreme Density
Neutron stars pack enormous mass into a small radius, producing extreme gravity, pressure, and density.
Pulsars
Some neutron stars are pulsars, emitting beams of radiation that sweep across space as the star rotates.
Magnetars
Magnetars are neutron stars with extremely strong magnetic fields that can produce powerful bursts of radiation.
Matter Under Extreme Conditions
Neutron stars are natural laboratories for matter at densities that cannot be reproduced easily on Earth.
Neutron Star Mergers
Merging neutron stars can produce gravitational waves and create heavy elements through rapid neutron capture processes.
Common Mistakes
A common mistake is thinking neutron stars are ordinary stars made only smaller. They are exotic remnants with extreme nuclear-density matter.
Why This Matters in Physics
Neutron stars connect stellar evolution, nuclear physics, gravity, magnetic fields, gravitational waves, and the origin of heavy elements.