Time was when all talk of communication between earthbound man and creatures on other planets seemed like a product of far-out science fiction. Today radio astronomers discuss such interplanetary conversation as a distinct possibility. In the magazine Science, German Astronomer Sebastian von Hoerner demonstrates with intricate mathematical logic that planets suitable for life may be fairly common among the stars. On some of those planets, says Von Hoerner, there may well be creatures intelligent enough to transmit radio messages across the enormous distances of interstellar space. But for all this skill, he says, such highly developed civilizations will rarely be...
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