Difference between Pulsar and Quasar

A pulsar is a neutron star with a penetrating magnetic field that generates periodic electromagnetic radiation. A quasar or quasar is a source of electromagnetic energy that contains radio frequency and visible light.


It is the acronym in English for pulsating star, which means (star that emits very intense radiation at short and regular intervals). It is basically a neutron star that generates periodic radiation. Pulsars have an intense magnetic field that induces the emission of pulses of electromagnetic radiation at regular intervals related to the object’s rotation.

Neutron stars can spin on their axis hundreds of times per second. A point on its surface moves at speeds of up to 70,000 kilometers per second. It means that neutron stars spin so fast that they expand their equator. In addition, that its stars have the size of between 10 and 20 kilometers.

The centrifugal force caused at this speed is great and only its powerful gravitational field prevents them from being destroyed. Pulsars are made up of an iron core that, as it spins at high speed, emits its own magnetic field, which is not centered on its rotating poles.


It is an astronomical source of electromagnetic energy, it has radio frequencies and visible light. They are phenomena that arise when a large black hole located in the nucleus of a galaxy absorbs all the matter that is in its vicinity.

When this happens, due to the enormous speed of rotation, a large amount of energy is produced that is released in the form of radio waves, light, infrared, ultraviolet and X-rays. This makes quasars the brightest objects in the universe. universe.

In telescopes they can be seen as simple points of light, although some seem to be the center of active galaxies.

Difference Between Pulsar and Quasar

  • Pulsars are neutron stars that periodically generate radiation. They are composed of three layers: a solid core, a liquid mantle, and a thin, solid crust.
  • Pulsars spin at high speed and generate regular pulses of electromagnetic radiation.
  • Pulsars are the product of the explosive transformation of a massive star.
  • Quasars are similar to stars, but they are not. They are extremely luminous objects at all wavelengths.
  • They are believed to form from black holes, when a large part of their mass is transformed into energy. This energy is what we can see as a quasar.
  • Quasars are capable of releasing energy capable of illuminating a galaxy with the equivalent of millions of suns.
  • Quasars are larger than pulsars.
  • Pulsars are dimmer than quasars.
  • Pulsars rotate.
  • Quasars do not rotate.

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