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Carbon Nanotube. You might think something like titanium or something but so far discovered its Carbon Nanotube. There might be something much harder in the universe of something. Carbon Nanotube is man made and can only be created in a microscopic sizes. If you're looking for something to USE. Steel or titanium would be perfect. Carbon Nanotube is so strong it could hold a asteroid orbiting around the earth. Which brings up the space elevator. You should search up information about the space elevator and you might find some more information on carbon nanotube.

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13y ago

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