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Cake day: December 24th, 2025

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  • You have some good comments here, but I’ll add one wrinkle: gas giants nearly invariably have lots of hydrogen. Add in enough oxygen (20% or so) for humans to breathe and you have a very flammable mixture.

    I don’t think a mixed hydrogen / oxygen atmosphere could naturally exist.

    But there would be an altitude where the pressure stays around 1 earth atmosphere. As long as the temperature and radiation situation was okay, you could get away with no special gear apart from an oxygen supply.

    (Except that humans breathe out most of the oxygen we breathe in. Which would create little flammable pockets of hydrogen-oxygen mixtures every time someone exhales.)