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It's a moot point, but I still want to point out that "a gas lighter than hydrogen" is a thing: it is simply hydrogen at a higher temperature, i.e. a hot-hydrogen balloon, analogous to a hot-air balloon.


I do not want to ride in a hot hydrogen balloon :)


Why not? Hydrogen inside a hydrogen atmosphere is perfectly safe.

It's hydrogen inside an oxygen atmosphere that's the problem.

(So on Jupiter, you wouldn't want to ride in an oxygen balloon, ie you wouldn't want to ride in a hot air balloon there.)


Well, maybe if there's no oxygen nearby.


If you have a planet with a hydrogen atmosphere, it's a pretty good bet there is no (free) oxygen nearby.


Fair point




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