Hollow World: Difference between revisions

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== Literature ==
* ''[[Journey to Thethe CentreCenter of Thethe Earth]]'' implies that there is a second sun at the core of our own planet, meaning we live on the outside of such a sphere. At the time, before the discovery of radioactive elements, this was <s>the mainstream</s> [[Popular History|one of several speculated]] <s>scientific</s> explanations for the Earth's internal heat.
* [[Edgar Rice Burroughs]] cemented the concept in pulp with Pellucidar, an internal world where he set several of his stories, including a notable crossover with Tarzan at Earth's Core.
* ''[[Choose Your Own Adventure]]: The Underground Kingdom'', which had a star in the middle of the earth and an advanced civilization living inside of the crust.