Why do pulsars send out regular flashes?
Quick Answer
Pulsars flash because their magnetic poles are misaligned with their spin axis, so their radiation sweeps past us like a lighthouse beam. Each rotation produces a pulse if Earth lies in the beam path.
The Full Story
A pulsar is a rapidly rotating neutron star with strong magnetic fields. Charged particles are accelerated near the magnetic poles and emit beams of radiation, often in radio wavelengths. Because the magnetic axis is usually tilted relative to the spin axis, the beam sweeps around as the star rotates. If the beam crosses Earth, we see a precise repeating pulse. This lighthouse effect makes pulsars useful for studying relativity and even for probing interstellar material.
Key Facts
YouTube Angle
Suggested video title for this topic:
"The universe has lighthouse stars—and they tick with amazing precision."