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active galaxy markarian-421 (1) |
bl lacertae objects : individual (markarian 421, markarian 501) (1) |
galaxies : active (1) |
gamma rays : observations (1) |
photons (1) |
radiation (1) |
active galaxy markarian-421 (1) |
bl lacertae objects : individual (markarian 421, markarian 501) (1) |
galaxies : active (1) |
gamma rays : observations (1) |
photons (1) |
radiation (1) |