We have updated our Privacy Policy Please take a moment to review it. By continuing to use this site, you agree to the terms of our updated Privacy Policy.
James Blish’s galaxy-spanning masterwork, originally published in four volumes, explores a future in which two crucial discoveries – antigravity devices which enable whole cities to be lifted from the Earth to become giant spaceships, and longevity drugs which enable their inhabitants to live for thousands of years – lead to the establishment of a unique Galactic empire.