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Still:As seen on this video posted by Elon Musk

https://twitter.com/elonmusk/status/1154629726914220032?s=19

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    $\begingroup$ Can you update your question and include a still image of what you are asking about? Not everyone will take the time to go to twitter and watch a video. $\endgroup$ Jul 26, 2019 at 14:25
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    $\begingroup$ ah yeah great idea. Doing that now $\endgroup$
    – Stickyz
    Jul 26, 2019 at 14:26

1 Answer 1

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That's a shock diamond. Commonly seen in jet and rocket exhaust.

enter image description here

There's a good explanation of the physics behind the diamonds here. Short summary: If the pressure at the exit of the engine doesn't match the ambient pressure, then shock waves will form and reflect throughout the plume, causing the diamond patterns.

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  • $\begingroup$ Awesome! thank you, does the Merlin produce these as well? 45 raptors at once is going to be quite pretty $\endgroup$
    – Stickyz
    Jul 26, 2019 at 14:43
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    $\begingroup$ It probably does - I'm not very familiar with Merlins - but since it uses kerosene as fuel the exhaust is a lot "yellower" and not as transparent, so it's harder to see them. $\endgroup$ Jul 26, 2019 at 14:45

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