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Space travel[1]: 69 [2]: 209–210 [3]: 511–512 or space flight[2]: 200–201 [4][5]: 2103–2105 is a major classic theme in science fiction.[4]
The Visual Encyclopedia of Science Fiction lists the following methods of spacecraft propulsion: anti-gravity, atomic (nuclear), bloater,[lower-alpha 1] cannon one-shot[lower-alpha 2], Dean, FTL, hyperspace, interialess, ion, photon, plasma, ram-jet, r. force[lower-alpha 3], solar sail, spindizzy and torchship. Many but not all are based on real scientific theories.[1]: 8, 69–77