Pop quiz time: what do Tekkaman Blade, Gundam 00, and Battle Angel Alita have in common?
They’re all anime that have space elevators and orbital rings. A space elevator is exactly what it sounds like; a tower that goes all the way from the ground up into geosynchronous orbit, so that you can get things into space on an elevator (or a vertically oriented train) instead of launching rockets. An orbital ring is a structure that goes all the way around the planet’s equator connecting several space elevators.
(Well, the Orbital Ring in Tekkaman actually isn’t as far from the Earth as one should be.)