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A comment on Lost Advanced Civilizations.

Re:Lost Advanced Civilizations by WalterBright on Wednesday August 19, 2020 @03:14AM (#24207963)
The scifi novel "The Hab Theory" by Eckert goes into some interesting debate about whether there were unknown previous advanced civilizations or not. It sounds almost plausible, but not quite.

"Inherit the Stars" by Hogan is another interesting take on it.

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Re:Lost Advanced Civilizations by LargoLasskhyfv on Wednesday August 19, 2020 @09:40AM (#24210234)
There is a fringe theory similar to HAB (thx for mentioning it btw., didn't know that) wherein the earth tilts by about 90 degrees for a few days and then back, but the mechanism is different. Supposedly caused by changing magnetism and structure/viscosity of some larger parts of earths molten layers, changing the center of gravity for a while, and so on.
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