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SX 'Jellyfish' and KSP2 Reentry plasma animations?

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Great post. This also shows something they did straight up wrong. Overexpanded plumes in vacuum look nothing like what they show in this video, with that convex-ish pyramid shape:

Adding a bit of insult to injury, they actually showcased the correct shape in a much previous video: 

Correcting exhaust behavior is a first step towards a jellyfish. As for reentry plasma, that's a whole different matter.


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Isn't it bulb-shaped in the videos of the spacex launches because they're not truly in vacuum, just in the upper atmosphere, so there's some gas interactions that slow the sideways velocity of the plume? In deep space I would think you would get that conical or even horn-shaped plume.

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