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And a really interesting layering of planetary diplomacy for this mechanic might be, you discover some relic technology or research engraved on some tomb world vault for the ADVANCED GRAVITICS eg LEVITATE ALL THE STUFF so floaty, but the world itself is some primitive caveman world you cannot make use of it or afford to upgrade through the civilisational steps / risk destabilising the culture with the sudden FUTURE SHOCK etc, so maybe you need to just trade it or give it away for free...
Pic related is just a cute random illustration of a robot spider cave witch woman I liked