What are called quasars? What is the luminosity of quasars?

These are the most powerful sources of visible, infrared and radio emission of radiation. The dimensions of quasars do not exceed several light days, that is, 10 ^ 13–10 ^ 14 m. The luminosity of quasars is 10 ^ 12 – 10 ^ 13 of the luminosity of the Sun. The brightest quasar 3C 273 is visible as a 12.6m star, located at a distance of about 3 billion sv. years and emits more energy in the optical range than the brightest galaxies. Apparently, quasars are the nuclei of distant galaxies in a state of very high activity.

Remember: The process of learning a person lasts a lifetime. The value of the same knowledge for different people may be different, it is determined by their individual characteristics and needs. Therefore, knowledge is always needed at any age and position.