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1355 points LorenDB | 2 comments | | HN request time: 0.456s | source
1. 420official ◴[] No.44303132[source]
It's liquid propellant being vented, the fuel is under extreme pressure so when its released it immediately expands to a gas. I don't know that Honda has said what their propellant is, but it's probably liquid hydrogen and liquid oxygen.
replies(1): >>44303189 #
2. ◴[] No.44303189[source]