Until within recent centuries, man has not only believed that he and his kind were the only intelligent creatures in the universe, but that the little round ball on which he lived was the dominant part thereof. So rooted for ages was this conviction that it became fixed in man's mental structure, and hence the survival of the idea that still lingers in the minds of a few to-day. The conclusion was natural, however, for the behavior of the starry heavens and the Sun and the Moon seemed sufficient evidence that man, and the surface upon which he lived, was the centre of the universe. The stars were bright points of light, the Moon a silver disk, and the Sun a heat and light giving ball of fire, equally diminutive and not far away. Let one realize for a moment the experience of these early people.
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