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The Hollow Earth hypothesis proposes that the planet Earth is either entirely hollow or otherwise contains a substantial interior space. The hypothesis has been shown to be wrong by 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 pseudoscientific and conspiracy theories . [ edit ] Hypotheses [ edit ] Ancient history
