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Q&A What light gas can I have in the upper atmosphere?

I want to have an upper atmosphere composed of a gas which is lighter than "air" so that my human occupants of a planet can harvest it and use it to fill blimps and hot air balloons. I'm planning ...

3 answers  ·  posted 10y ago by Liath‭  ·  last activity 10y ago by Liath‭

Question atmosphere reality-check