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Re:Airlander 10: Longest aircraft damaged during flight by aaron695 on Wednesday August 24, 2016 @10:08PM (#12356549)
None. I thought. Methane is also flammable and a vacuum is not a gas and not currently possible.

But wiki says Ammonia (Hard to combust)-

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

Off planet you obviously have other options.

But a complex molecule might work I assume?

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