Why do pulsars produce regular pulses?
Pulsars are neutron stars whose radiation beams cross our line of sight as they rotate. Recorded pulses do not mean the entire star switches on and off each turn. A lighthouse analogy describes directional radiation sweeping past an observer.
Rotation and magnetic axes
The magnetic and rotation axes need not align. Accelerated particles in the magnetosphere generate radiation at various wavelengths. Pulses are observed only if a beam intersects Earth. Rotation can slow as the star loses energy. In some binaries, transferred material spins a neutron star up again, helping explain many millisecond pulsars.
Precision clocks and measurement limits
Pulse arrival times probe binary orbits, dense matter, and spacetime effects. Long-term timing of many pulsars can reveal low-frequency gravitational waves. Pulsars are not perfect clocks: rotational glitches, interstellar propagation, and instrumental effects require modeling. Regularity is not evidence of artificial origin; rotation and multiwavelength observations provide a natural explanation.