John W Campbell was an American author and editor of science fiction, seen as being very influential within the genre he is often credited with shaping the "golden age" of science fiction and was the editor for the Astounding Science Fiction magazine (later known as Analog Science Fiction and Fact).
Prior to being the editor of Astounding, he wrote space opera scifi under his own name and the pseudonym Don A. Stuart.
The surest sign that intelligent life exists elsewhere in the universe is that none of it has tried to contact us.
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