The review identifies and discusses key unsolved problems in planetary nebulae such as 3D morphology, multipolar origins, dust distribution, binarity, and the abundance discrepancy, along with suggested future directions.
CO in the C1 globule of the Helix nebula with ALMA
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Current Unsolved Problems in Planetary Nebulae Research
The review identifies and discusses key unsolved problems in planetary nebulae such as 3D morphology, multipolar origins, dust distribution, binarity, and the abundance discrepancy, along with suggested future directions.