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The materials carbon and kevlar fiber composites have the highest strength to weight ratio. Molded panels and structures are relatively cheap and lightweight to construct and launch.


However, meteoroids are a very real danger in space do to a high potential of catastrophic decompression upon impact. Although composite materials have the highest strength to weight ratios of available materials, they disintegrate upon impact as was discovered during ballistics testing of the YF-22's wing. Subsequently, one third of the spars were replaced with titanium. This kept the plane structurally able to continue flight.


In space, this would not be enough to prevent decompression. The best materials to prevent penetration would be quite heavy. Think tank armor: depleted uranium, high nickel super-alloys or the titanium alloy Tiadyne 3515 (Titanium 50%, Vanadium 35%, Chromium 15%) which has the highest strength to weight ratio of the metal alloys.


It all boils down to levels of protection and probabilities of survival. At $10,000 per kilogram to get things into orbit, one might consider using available resources on your space settlement. If on the moon, for example, tunneling under the surface would be best. The moon itself would then be the most durable, cheapest, and lightest material.

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14y ago
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15y ago

carbon nanotubes

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Q: What is the lightest but strongest material on earth?
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