About this eBook
地球生命是從哪裡來的在人類幾千年的發展過程中，這個問題一直困擾著我們。有的科學家認為，地球生命可能源自火星，也可能誕生於空中。大多數科學家都認為，生命起源於一個類似現代的細菌那樣的“先祖”。它後來進化為植物、動物和人類等各種生命形式。然而，歐美國家的天文學家最近提出，火星早在地球冷卻前，就已經適合生命的存在，我們人類的祖先很可能是某種形式的“火星人”。
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