Why do pulsars have light on two ends?

Pulsars emit beams of electromagnetic radiation from their magnetic poles, which are misaligned with their rotational axis. As the pulsar spins, these beams sweep across space, much like a lighthouse beam. If the Earth is in the path of these beams, we observe periodic flashes of light, leading to the appearance of light on two ends as the pulsar rotates and the beams sweep past our line of sight. This effect creates the characteristic pulsing signal associated with pulsars.