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Let's float an island on an astrophysical jet

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An astrophysical jet is a stream of particles emitted by matter falling into an supermassive star/black hole, travelling at up to 80% the speed of light.

A troll with a portal gun (which places portals instantly) wants to have his house floating above the ground (with his garden) just by using a small part of a jet.

Is this possible? (Probably not)
What issue would come up? Which other unreal technologies would be needed to solve the issues and make this possible?

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This post was sourced from https://worldbuilding.stackexchange.com/q/134204. It is licensed under CC BY-SA 4.0.

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