Rané galaxie
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Aktívne galaktické jadro (AGJ) je kompaktná oblasť v centre galaxie, ktorá je v niektorej časti elektromagnetického spektra, zvyčajne naprieč celým spektrom, omnoho jasnejšia ako normálne galaxie. Tieto extrémne emisie boli pozorované v každej časti elektromagnetického spektra. Galaxie, v ktorej sa AGJ nachádza, sa nazýva aktívna galaxia. Predpokladá sa, že žiarenie AGJ je výsledkom akrécie hmoty okolo supermasívnej čiernej diery v centre materskej galaxie. AGJ je najjasnejším dlhodobým zdrojom elektromagnetického žiarenia v celom vesmíre.
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