Asimov’s career could be divided into a number of durations. His early career, dominated by science fiction, started with brief stories in 1939 and novels in 1950. This lasted till about 1958, all but ending after publication of The Naked Sun . Following the temporary orbit of the primary man-made satellite Sputnik I by the USSR in 1957, his production of nonfiction, notably in style science books, tremendously increased, with a consequent drop in his science fiction output. Over the following quarter century, he wrote only 4 science fiction novels, while writing over one hundred twenty nonfiction books.
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