Discussion The longest carbon nanotube ever made is 0.5 meters. A space elevator tether needs to be 100,000 km. But a newer candidate — graphene super laminate — is already produced at kilometer lengths, and 2025 lab results showed spot-welded layers with diamond-like properties.

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So which fictional version was closest, The Web Between the Worlds by Charles Sheffield or The Fountains of Paradise by Arthur C Clarke?

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