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Extragalactic nebulae --- Extragalaktische nevels --- Galaxies --- Galaxieën --- Melkwegstelsels --- Nebulae [Extragalactic ] --- Nevels [Extragalaktische ] --- Nébuleuses extragalactiques --- 521.03 --- Astrophysics --- -Galaxies --- -Stars --- -Sidereal system --- Circumstellar matter --- Nebulae, Extragalactic --- Astronomy --- Astronomical physics --- Cosmic physics --- Physics --- Theoretical astronomy. Celestial mechanics--?.03 --- Congresses --- Formation --- -Congresses --- Stars --- Congresses. --- -Theoretical astronomy. Celestial mechanics--?.03 --- 521.03 Theoretical astronomy. Celestial mechanics--?.03 --- Sidereal system --- Formation&delete&