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Sounds like it was just compressed air (rechargeable on the fly). Impressive if true.

I am pretty skeptical that that’s actually what was used in the demo. It would be so much simpler to just use whatever they use for the rockets for the demo, which certainly isn’t rechargeable

Only if you don't mind killing the audience:

https://en.wikipedia.org/wiki/SpaceX_Draco

https://en.wikipedia.org/wiki/Monomethylhydrazine

They actually use cold gas thrusters for the rockets.

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