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Message: <blockquote data-quote="s/LaSH" data-source="post: 1629817" data-attributes="member: 6929">'Other'.My Twilight world is theorised to be a variant of the Dyson Sphere. By disassembling the entire solar system, including the sun, and building additional spheres in hyperspace 'beside' the core, and then stocking the lot with comparatively tiny, localised suns and floating continents to provide day/night cycles, the Ancients created a world with no discernible outside. The crust is 3 kilometres thick, and contains a nigh-impenetrable exotic element that generates gravity. The whole structure is about 2/3rd the orbital radius of Mercury. So everyone lives on the inside - it's not necessarily hollow, because to be hollow you need an outside, and nobody's really sure if there's anything out there at all. Their understanding only got this far by having the occasional civilisation so much greater than our own that they came up with the theory of solar-system formation all on their own, without examples. (Then the civilisations fell, and nobody noticed on the scale of the massive interior. It's a recurring theme.)My Arcturus sci-fi B-movie setting assumes that every planet is hollow and lit by its own internal sun. I then explain everything with 'gravitium deposits', 'gravitium-lensed solar-type phenomena', and stuff like that. It's fun and I should do more with that.Anything else I do tends to have solid planets.</blockquote>