Before there was a Flat Earth Theory (in recent history at least), the Hollow Earth Theory was QUITE popular! There are some curious and exciting ideas about what these realms might exist, along with some potential evidence for such a theory! Let's have a look and see what's what...
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Halley, Edmond, An Account of the cause of the Change of the Variation of the Magnetic Needle; with an Hypothesis of the Structure of the Internal Parts of the Earth, Philosophical Transactions of Royal Society of London, No. 195, 1692, pp 563–578
Sandifer, C. (2014). Euler and the Hollow Earth: Fact or Fiction? (April 2007). In How Euler Did Even More (pp. 209-214). Mathematical Association of America. doi:10.5948/9781614445197.032
Simon, Matt. "Fantastically Wrong: The Real-Life Journey to the Center of the Earth That Almost Was". Retrieved 18 September 2019
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