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Old 12-15-2016, 04:50 PM   #4 (permalink)
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Join Date: Nov 2004
Location: Missouri, USA
Posts: 4,820

A model like this seems ridiculous:

They most likely use artificial sources of light or even natural sources, as many plants can give off light. Being such an old / advanced civilization, the possibilities are virtually endless. But a sun inside of the planet? No. The core is solid.
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