Describe the feature

I think it would be very great for modpack makers if there was a config file where you could define custom planets (and systems) a-la AR's planet defs style.

There could be a option to set the planets icon (which could also be the picture for orbit) & and other various settings i.e; gravity, breathability, rocket tier along with dim mapping. It doesn't have to be able to define it's own custom dimensions, just mapping an already existing dimension would be awesome :)

Additional context

No response

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