Anti-gravity (also known as non-gravitational field) is a hypothetical phenomenon of creating a place or object that is free from the force of gravity. It does not refer to either the lack of weight under gravity experienced in free fall or orbit, or to balancing the force of gravity with some other force, such as electromagnetism or aerodynamic lift. Anti-gravity is a recurring concept in science fiction. Examples are the gravity blocking substance "Cavorite" in H. G. Wells's The First Men in the Moon and the Spindizzy machines in James Blish's Cities in Flight.
"Anti-gravity" is often used to refer to devices that look as if they reverse gravity even though they operate through other means, such as lifters, which fly in the air by moving air with electromagnetic fields.[1][2]
- ^ Thompson, Clive (August 2003). "The Antigravity Underground". Wired. Archived from the original on 18 August 2010. Retrieved 23 July 2010.
- ^ "On the Verge of Antigravity". About.com. Archived from the original on 23 February 2017. Retrieved 23 July 2010.