It's a sci-fi/fantasy story.
Person A wants to write: "They were looking for something stored on our world..."
Person B thinks it should be : "They were looking for something stored in our world..."
"They" in this context is a group of space-faring aliens.
Person A thinks you can say "on our world" similar to how you can say "on our roof" or "on our boat".
Person B thinks it has to be "in our world", because you wouldn't say 'something stored in France'.
Who's right?
I recommend on our planet OR in our world . CJ
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Woops, typo in that 2nd last line.
Person B thinks it has to be "in our world", because you wouldn't say 'something stored on France'.