The long-standing belief that the only intelligent life in the universe exists on our planet, Earth, is gradually disappearing. As early as the 13th Century, philosophers ruminated on the possibility of other planets in the celestial void supporting intelligent life. Current (1977) scientific thought maintains that if any life other than our own does exist in this small corner of the universe, it is of a simple biological form only, not what could be classified as intelligent. Recent estimates (1977) by of these same scientists, however, suggest a probability of as many as 1 million advanced civilizations existing in the Milky Way galaxy alone.
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