Edmund Halley's Hollow Earth Theory

In a 1692 scientific paper, Edmund Halley - yes, he of comet fame -
put forth the idea that Earth consists of a shell about 800 km thick,
and of two inner concentric shells and an innermost core with about
the same diameter as the planet Mars... To compound his error, Halley
proposed that the inner spheres might be inhabited and that the inner
atmosphere was made up of luminous gases that, when escaping outward,
cause the Aurora borealis... Details:
http://strangemaps.wordpress.com/2007/03/01/85-inside-the-hollow-earth/

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