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[i]For its first fully-integrated test, though, SpaceX appears to have put Starship through a fairly limited cryogenic proof – a test where flammable propellant is replaced with a similarly cold (cryogenic) fluid that's similar enough to subject a rocket to similar thermal and mechanical stresses.
For Ship 20 and Booster 4's combined debut, Super Heavy was filled maybe 10-20% and Starship around 25-50% of the way with either liquid nitrogen (LN2) or a combination of LN2 and liquid oxygen (LOx). It's difficult to tell but it's unlikely any methane (LCH4) fuel was involved.[/i]
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