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| English | Russian |
| active galactic nucleus | активное галактическое ядро (a compact region at the center of a galaxy that has a much-higher-than-normal luminosity over at least some portion of the electromagnetic spectrum with characteristics indicating that the luminosity is not produced by stars. Such excess non-stellar emission has been observed in the radio, microwave, infrared, optical, ultra-violet, X-ray and gamma ray wavebands. Alex_Odeychuk) |
| active nucleus | активное ядро |