Quasars are quasi-stellar radio sources – highly active nuclei of distant galaxies. Radio galaxies are galaxies with active nuclei that are sources of high-power radio emission. Cosmic microwave background radiation – radio emission at a wavelength of 7.35 cm, which confirmed that the Universe was hot in the early stages of expansion.
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.