Anti-gravity | Wikipedia audio article

This is an audio version of the Wikipedia Article:


00:01:26 1 Hypothetical solutions
00:01:37 1.1 Gravity shields
00:02:44 1.2 General relativity research in the 1950s
00:07:14 1.3 Fifth force
00:09:32 1.4 General-relativistic "warp drives"
00:10:36 1.5 Breakthrough Propulsion Physics Program
00:11:21 2 Empirical claims and commercial efforts
00:11:48 2.1 Gyroscopic devices
00:13:28 2.2 Thomas Townsend Brown's gravitator
00:15:31 2.3 Gravitoelectric coupling
00:17:05 3 Göde Award



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- Socrates


SUMMARY
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Anti-gravity (also known as non-gravitational field) is a theory of creating a place or object that is free from the force of gravity. It does not refer to 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, particularly in the context of spacecraft propulsion. 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.
In Newton's law of universal gravitation, gravity was an external force transmitted by unknown means. In the 20th century, Newton's model was replaced by general relativity where gravity is not a force but the result of the geometry of spacetime. Under general relativity, anti-gravity is impossible except under contrived circumstances. Quantum physicists have postulated the existence of gravitons, massless elementary particles that transmit gravitational force, but the possibility of creating or destroying these is unclear.
"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.