The planetary nebulae of gas and dust that are formed from red-giant stars are usually far from spherical in shape. Observations of the gas distribution in one red giant caught in the act of transition show why.
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Claussen, M. Nebulous explanation. Nature 417, 798–799 (2002). https://doi.org/10.1038/417798a
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DOI: https://doi.org/10.1038/417798a
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