Abstract:Abstract. The Hubble Space Telescope has served the critical roles of microscope and movie camera in the past 20 years of research on planetary nebulae ("PNe"). We have glimpsed the details of the evolving structures of neutral and ionized post-AGB objects, built ingenious heuristic models that mimic these structures, and constrained most of the relevant physical processes with careful observations and interpretation. We have searched for close physical binary stars with spatial resolution ∼50 AU at 1 AU, loca… Show more
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