HOLLOW EARTH
Hollow Earth is a belief that the planet Earth has a hollow interior and, possibly, a habitable inner surface.
In ancient times, the idea of subterranean realms seemed arguable, and became intertwined with the concept of "places" such as the Greek Hades, the Nordic svartalfheim, the Christian Hell, and the Jewish Sheol.
Edmund Halley in 1692 put forth the idea of Earth consisting of a hollow shell about 800 Km (500 mi) thick, two inner concentric shells and an innermost core, about the diameters of the planets Venus, Mars, and Mercury. Atmospheres separate these shells, and each shell has its own magnetic poles. The spheres rotate at different speeds. Halley proposed this scheme in order to explain anomalous compass readings. He envisaged the atmosphere inside as luminous and possibly inhabited.
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