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Hollow Earth
The Hollow Earth hypothesis proposes that the planet Earth is either wholly hollow or otherwise contains a substantial interior space. The hypothesis has long been contradicted by overwhelming observational evidence, as well as by the modern understanding of planet formation; the scientific community has dismissed the notion since at least the late 18th century. The concept of a hollow Earth still recurs in folklore and as the premise for subterranean fiction, a subgenre of adventure fiction. It is also featured in some present-day scientific, pseudoscientific and conspiracy theories. (via charlesfosterofdensen)
