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The silver material surrounding the base of the Falcon Heavy second-stage engine jerks suddenly in this video from the Starman stream at 3:31:26

Is this due to a particle impact?

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I can't answer definitively, but based on my hypervelocity impact testing experience, that doesn't really look like what you'd get if a thin sheet was hit by high-speed orbital debris -- there's no light flash, no vapor cloud, and no noticeable hole afterward. It looks more to me like something behind it moved suddenly.

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I also cannot answer definitively, but can add that the thermal radiation shielding moves several times from this camera view.

I did not watch all 4 hours of the video to see how many times it moved but I did see it happen at the following times in the video.

1:21:43

1:56:45

2:59:40

Other than something moving underneath of the shielding, my best guess would be thermal expansion and contraction... but I did not study the film enough to determine if there was a pattern of where the sunlight/shadow was impacting the shielding and if there was movement in correlation to that.

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