Sci fi technology and ways to make it real

This thread is to discuss the possible techs usable in space stage, for example: this can include possible stuff like dyson spheres/swarms, or impossible like FTL drives or ascension gates, you can discuss how to make them possible, how to create them, and techs essential to space stage.

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Where would orion drive(s) belong in between “real techs” and “scifi techs”? They were never built irl but according to the engineers of the project they should’ve worked without any scifi crap thrown at them.

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I’d consider anything possible to be real techs

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Well then I suppose nuclear pulse propulsion would be non-scifi.

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How about techs like Bussard Ramjets, which are scientifically possible but later discovered to be essentially unusable due to the interstellar medium being much lower density for it to work in reality.

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Perhaps they could still be possible where the medium is denser?

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things that are unusable should be a third category now that I think about it

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Don’t worry, enough scifi magic can make ANYTHING usable!

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