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Hollow Earth
The
Hollow Earth
hypothesis
proposes that the planet
Earth
either is entirely hollow or otherwise contains a substantial interior space. The
scientific community
has dismissed the notion since at least the late 18th century. The concept of a hollow Earth recurs many times 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
.
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