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| title | chunk | source | category | tags | date_saved | instance |
|---|---|---|---|---|---|---|
| Anti-gravity | 3/3 | https://en.wikipedia.org/wiki/Anti-gravity | reference | science, encyclopedia | 2026-05-05T09:16:54.702608+00:00 | kb-cron |
== In fiction == The existence of anti-gravity is a common theme in science fiction. The Encyclopedia of Science Fiction lists Francis Godwin's posthumously published 1638 novel The Man in the Moone, where a "semi-magical" stone has the power to make gravity stronger or weaker, as the earliest variation of the theme. The first story to use anti-gravity for the purpose of space travel, as well as the first to treat the subject from a scientific rather than supernatural angle, was George Tucker's 1827 novel A Voyage to the Moon.
=== Apergy === Apergy is a term invented by Percy Greg for a imaginary anti-gravitational force used in his 1880 sword and planet novel Across the Zodiac. The term was later adopted by other fiction authors such as John Jacob Astor IV in his 1894 science fiction novel A Journey in Other Worlds.
== See also ==
== References ==
== Further reading == Bly, Robert W. (2005). "Antigravity". The Science in Science Fiction: 83 SF Predictions That Became Scientific Reality. Consulting Editor: James Gunn. BenBella Books. pp. 21–26. ISBN 978-1-932100-48-8. Cady, W. M. (15 September 1952). "Thomas Townsend Brown: Electro-Gravity Device" (File 24–185). Pasadena, CA: Office of Naval Research. Public access to the report was authorized on 1 October 1952.
== External links ==
Kleiner, Kurt (5 August 2002). "The Hunt for Zero Point by Nick Cook". Salon. Review. Archived from the original on 15 January 2011. An editor for the esteemed Jane's Defense Weekly says the U.S. government has been working on Nazi anti-gravity technology in secret for 50 years Review of a book about a conspiracy theory around anti-gravity.