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RE: PROOF Thrust is Not Possible in a Vacuum - Flat Earth
Rockets use chemical oxidizers rather then gaseous oxygen for the combustion. While liquid oxygen is an option, storing it is energy demanding and as such it's a bad option. That is circumvented by the use of ammonium perchlorate.
I didn't say YOU were dumb, just the video. I'm sure you are just confused like so many others in the modern world.