Plural of antichthon; hypothetical inhabitants of a counter-earth or the counter-earth itself, as theorized in ancient Greek philosophy.
From antichthon + Greek -es (plural ending). The term was used by ancient philosophers to refer both to the theoretical planet and to any beings who might inhabit such an opposite world.
The antichthones represent humanity's first 'alien life' concept—not invaders from space, but an entire opposite civilization on the unseen side of the sun, showing how ancient thinkers imagined worlds beyond what they could see.
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