The 365 Days of Astronomy Awesome Astronomy - How Realistic is a Space Elevator?
Aug 20, 2025
Imagine riding an elevator into space instead of blasting off in a rocket! The hosts explore the science and engineering behind this ambitious concept. They tackle the immense challenges of construction, from the materials needed to withstand extreme conditions to the logistics of such a massive project. The risks of space debris and potential cable failures add to the complexity. Despite the hurdles, the discussion inspires a forward-thinking view on the future of space exploration!
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Why Geostationary Location Matters
- A space elevator requires a platform in geostationary orbit directly above the equator to remain fixed over one ground point.
- That platform must be about 22,236 miles up and tethered to Earth by an extremely long cable with a counterweight outwards.
Cable Must Extend Past The Platform
- A space elevator needs cable both below and well above the platform so centrifugal force keeps the tether taut and stable.
- The counterweight and extra cable beyond geostationary altitude make construction and launch logistics extremely difficult.
Materials Are The Primary Barrier
- The tether would require materials hundreds of times stronger than steel or impractically huge dimensions if using current fibers.
- Promising materials like carbon nanotubes or graphene are not yet mature enough for a safe, durable 22,000-mile cable.