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公元前7世纪，巴比伦人认为，天和地都是拱形的，大地被海洋所环绕，而其中央则是高山。古埃及人把宇宙想象成以天为盒盖、大地为盒底的大盒子，大地的中央则是尼罗河。古印度人想象圆盘形的大地负在几只大象上，而象则站在巨大的龟背上，公元前7世纪末，古希腊的泰勒斯认为，大地是浮在水面上的巨大圆盘，上面笼罩着拱形的天穹。 也有一些人认为，地球只是一只龟上的一片甲板，而龟则是站在一个托着一个又一个的龟塔……
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