Related articles:
Vril
Martin Gardner
Agartha
Weightlessness
Thule Society
The Narrative of Arthur Gordon Pym of Nantucket
Edgar Rice Burroughs
Outer core
Conspiracy theory
Earth
Key terms:
idea
inner
pole
hollow earth
shell
interior
symmes
planet
concave
sphere
gardner
hypothesis
openings
expedition
gravity
outer
teed
reed
subterranean
shaver
edgar
bernard
journey
cavern
reynolds
voyage
north pole
halley
inner earth
spherical
followers
inner sun
mention
mcbride
antarctica
abdelkader
burroughs
pellucidar
concentric
supposedly
dyson sphere
adolf hitler
hollow shell
gravitational
hollow earth hypothesis
martin gardner
leonhard euler
science fiction
concave hollow earth
interior of the earth
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