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Now, that (if) this works, there should be no reason why it has to be the whole half of a planet - it can be any distance at the orbits circumference. Even 100 meters. Right?

**Now the most interesting part.**

If we put this object a, say, evacuated tube with magnetic system to propel the object back and forward, provided that we deal with power issued and losing-orbit-while-accelerated problem[*] and more power to counter the "dead-weight" of the whole system[**] (magnetic fields actually would push the tube/ system of the object and stay on top of it) -

**would it [the tube/ system] just levitate relatively stationary somewhere around the path of what would be an orbit?**

[*] could this be dealt with just making the system a disk, "donut" or something like that while cutting down power consumption at the same time?

[**] if the system is at high orbit where friction is no a problem and the whole system is separated in part, there would be, essentially, 3 parts - the object and two [maybe even one is enough] part that actually orbits the planet in opposite direction waiting to bounce at the object and there would be no "dead weight" . In a .. flying saucer scenario it is a bit more complicated as forces on the system accelerating the object somewhat cancels out (although there would be a time delay.. ).