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Old October 17th 17, 07:56 AM posted to sci.astro.amateur
Gerald Kelleher
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Posts: 1,551
Default Supernova structure

https://www.scientificamerican.com/s...E81BC8B34C6357

Stellar evolution has a specific geometry to it whether as the antecedent supernova star or after the event occurred -

https://apod.nasa.gov/apod/image/0701/sn1987a_hst.jpg