Celestial Lattice Space Elevator: Ground-to-Apex Through-Orbit Spine by Kaveh Dimitri Salahi

The Celestial Lattice Space Elevator is a single continuous tether that rises from a floating equatorial ocean anchor, passes through a hub at geostationary altitude (35,786 km), and ends at an Apex Departure Platform near 100,000 km. One structural spine carries a climber from sea level to the top with no transfer between separate systems. The spine is built from the Circular Spring-Piston Chain, a tether of identical articulated ring links, each threaded with a nanotube-class load core and each damping its own share of shock and vibration. Along its full length the chain serves at once as a structure, a power line, a fluid line, a data line and a climbing track. The decision to extend the tether well past geostationary orbit is what turns the elevator from a ride to orbit into a launch system. Every point on the tether turns with the Earth once per day, so the higher a point sits, the faster it moves through space. Above roughly 46,750 km that speed exceeds local escape velocity, and a payload released there leaves Earth without any engine burn. At the apex, the excess speed after escape is about 7.3 km/s, enough for direct transfers to Mars, the asteroid belt and, with a small correction, the outer planets. The same mass above geostationary orbit that makes these releases possible also acts as the counterweight that keeps the whole tether in tension, so the departure platform does structural work as well as operational work. The design rests on three engineering principles. Tension is carried by carbon-nanotube or graphene-class fiber, the only material class whose specific strength allows a tether of this length to hold its own weight with a sound safety margin. The tether crosses the atmosphere in a slim profile while each climber carries its own pressure hull, so that the structure offers the wind as little surface as possible. Climbers travel at a measured 200 to 300 m/s, which keeps sideways loads, power demand and wear on the track within the reach of real hardware and turns the journey to geostationary orbit into a trip of about two days.