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For questions about the gases which surround a planet or some other celestial body.

7 votes

How could an Earth-like planet support all-metal airships?

anything that big and made with armor that heavy (iron/steel hull as per your references to tanks and warships) being able to be held afloat with technology of the early 20th century, even in a much denser atmosphere … See here: Realistic Airships I don't see a world with a breathable gas atmosphere that could support such weight, unless you want to get into the realms of breathable liquid atmosphere, in which case …
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