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by londons_explore
2775 days ago
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Loon balloons are helium, and helium gas is famously hard to contain, so eventually leaks out and the balloon comes down. I don't see any way to make a balloon stay up forever unless you have a particle accelerator to manufacture new helium to make up for leakage... |
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It's not like there are any better options? The only two practical lifting gases are hydrogen and helium. Hydrogen leaks even more than helium and is flammable, even though it is much cheaper and abundant.