My source: > "No current material exists with sufficiently high tensile strength and sufficiently low density out of which we could construct the cable," he to

My source: > "No current material exists with sufficiently high tensile strength and sufficiently low density out of which we could construct the cable," he told me. "There's nothing in sight that's strong enough to do it — not even carbon nanotubes." "The best that theorists can do right now is come up with a material that's about two-thirds the strength needed to make a practical elevator," Henson told me. "And that's a very, very short tiny tube."[0] [0]https://io9.gizmodo.com/why-well-probably-never-build-a-space-elevator-5984371 https://io9.gizmodo.com/why-well-probably-never-build-a-spac...