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Cake day: September 6th, 2024

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  • Ok I’m sorry. Yes, it likely would require some minimal active control to maintain stability. You have a point about perturbations from other bodies. But the Trojan asteroids and Lagrange points have minimal effect. And it’s not like the gravitational field around the Sun actually changes that much, percentage wise, unless you’re right up close to the planets. The Trojans and Lagrange points are just examples of locations where objects gently placed in certain locations can maintain stability.

    Jupiter’s Hill Sphere has a radius of 50 million kilometers (actually much smaller than the outer gas giants.) Its orbital radius is more like 780 million km.

    Now, this does mean it would be quite difficult to build a Solar System-sized orbital ring right near the orbital path of gas giant, or any other planet. You could build a ring around Jupiter, but building a Solar-centric ring right near Jupiter’s orbit would be a problem.



  • What I’m describing is actually possible with ordinary materials, unlike the space elevator. This is less science fiction than a space elevator. Steel is good enough. Oh, and the throughputs possible for systems like this make a space elevator look like a toy.

    I’m referring to concepts like the orbital ring.

    You could absolutely build a train to space using such active support methods. And a more fanciful and impractical version is vast water-filled structures that allow one to literally a sail a boat to the Moon. I doubt someone would actually go to the trouble of building such a massive and impractical construct for such a silly purpose. But in principle it is possible.












  • Theoretically, it’s possible to use circular motion to build a train to orbit. Literally, you could have a floating platform suspended above the Earth’s surface and a train line running right up to the thing. One could have a stationary ring circling the entire planet that you could ride a train right up to. Hell, with sufficient mastery of circular motion, you could build a structure that allowed you to sail a boat to the Moon.

    If you’re going to quote orbital mechanics as to why this is impossible, you don’t know as much about orbital mechanics as you think you do.