Cities in Flight by James Blish:
Science Fiction Inventions, Technology and Ideas
Cities in Flight is really four separate novels; They Shall Have Stars (1957), A Life for the Stars (1962), Earthman Come Home (1955) and The Triumph of Time (1958). The period of time spanned by these four novels adds up to many hundreds of years. The books all derive their plot from a single great idea - the spindizzy, a gravity polarizer that allows entire cities to break free of the Earth and leave for the stars. This is a great science-fiction novel; it has wonderful inventions, well-written characters, and remarkable political sophistication. Select
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