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Faster than light travel is impossible, and the result of more mundane interstellar travel between the eighty worlds of the empire results in relativistic effects due to the high speeds involved; as such, the ages of space travelers become out of sync with those of their friends and family, an effect known as the "Time Thief".
Inertialessness, though not for faster-than-light travel, is discussed in Robert A. Heinlein’s Methuselah's Children, Isaac Asimov's short story The Billiard Ball, Larry Niven’s Known Space universe, Orson Scott Card's Speaker for the Dead, Arthur C. Clarke's 3001: The Final Odyssey, and
Discovery Channel Magazine stated that vanishing spaceships, faster-than-light travel and dematerialized transport were only dreams at the time the original series was made, but physicist Michio Kaku believes all these things are possible.