pulsar

A pulsar is a type of neutron star that emits regular beams of electromagnetic radiation from its magnetic poles. These beams are like cosmic lighthouses, and as the star spins rapidly—sometimes hundreds of times per second—these beams sweep through space. When Earth intersects with these beams, we detect them as highly regular pulses of radio waves or other signals. Pulsars are incredibly dense remnants of massive stars that have exploded as supernovae, with magnetic fields trillions of times stronger than Earth's. Their precise signals help scientists study extreme physics and even detect gravitational waves.