The idea of a “space elevator” – a structure that would allow material and/or people to move from Earth’s surface into space (and back) without the use of rockets – dates back to the late 1800s when Konstantin Tsiolkovsky proposed a free-standing structure that would stretch from the surface of the Earth to a geostationary orbit 22,236 miles (35,786 km) up. Over the past century a number of different concepts (e.g., using a counterweight in space to support the structure) and technological innovations (e.g., carbon nanotubes) have come along that have put this ambitious idea more within reach. Continue reading →
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