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Natural SciencesAstronomyPhysicsAstrophysicsExtragalactic AstronomyGalactic AstronomyAccretion DisksAccretion PhysicsAccretion ProcessesCircumgalactic MediumGalactic AstrophysicsHigh-energy Astrophysical SourcesAccretion EventsAccretion HistoriesAccretion OutburstsInterstellar Gas AccretionRadiative Accretion Processes