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I saw aerogel, and someone make a chocolate mousse using a vacuum chamber to get a much airier mousse. I always think, all we need is something like aerogel that doesn't diffuse air in and then we can have a vacuum airship. A material that is vacuum bubbles suspended in a lightweight material. Probably higher mass than a helium airship but maybe more buoyant per m^3
Potentially greater buoyancy, no flame risk, no risk of helium price... inflation.
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