The Great Serpent Mound is a 1,348-foot (411 m)-long, three-foot-high prehistoric effigy mound ... end of a 120-foot (37 m)-long hollow oval feature that may represent the snake eating an egg, .... The Halley's Comet's tail has always appeared as a long, straight line and does not resemble the curves of the Serpent Mound.
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