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Planetary NebulaeGALAXIESDark MatterMagnetic FieldVery Long Baseline InterferometryGeneral RelativityCircumstellar MatterMassive StarsSynchrotron EmissionSupermassive Black HoleStar Formationthe Milky WayModified GravityParticle AccelerationPlanetary NebulaInterstellar MediumGravitational WaveRadioFaraday RotationActive Galactic Nucleus