>>22666142The rocket exhaust is being illuminated
This is only possible when it's launched a few minutes before sunrise or sunset
The sun is still illuminating the upper atmosphere but not the ground, leading to the exhaust only being visible for a short duration
The reason it speads out like that is because of the lower pressure in the upper atmosphere
All you have is "This phenomenon I don't understand kinda looks like water, so therefore it is water"
https://www.youtube.com/watch?v=Y1Hfiirwgys