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Gravity
What is Gravity?
Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. Gravity is not just the attraction between objects and the Earth. It is an attraction that exists between all objects, everywhere in the Universe. Sir Isaac Newton (1642 — 1727) discovered that a force is required to change the speed or direction of movement of an object. He also realized that the force called "gravity" must make an apple fall from a tree, or humans and animals live on the surface of our spinning planet without being flung off. Furthermore, he deduced that gravity forces exist between all objects. Read More »
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Gravity: String Theory
Last Updated on 2009-04-14 at 12:21
There was hardly any time to wrestle with the implications of these ideas before yet another revolution in thinking hit the theoretical fan. In 1982, John Schwartz and Michael... More »
Gravity: What is Gravity?
Last Updated on 2009-03-25 at 20:40
What is Gravity?
There are many articles here in the Encyclopedia of the Cosmos focusing on various aspects of gravity, as listed in "Related EoC Articles" below. However,... More »
Gravity: Supersymmetry
Last Updated on 2009-03-25 at 20:39
While the quantum gravity program got hoplessly bogged-down in these and otherthorny issues, in 1973, a breakthrough occurred in another area of theoretical physics. Some might... More »
Gravity: Superspace Quantization
Last Updated on 2009-03-25 at 20:38
By the 1960's several new attacks were launched on the theoretical underpinnings of the quantum gravity program by Arnowitt, Deser, Misner and Wheeler. The basic idea was simple:... More »
Gravity: Renormalization
Last Updated on 2009-03-25 at 20:28
By the late 1960's, the Canonical Quantum Gravity or 'Superspace Quantization' approach quickly bogged down in an ever-growing mathematical formalism inwhich the equations... More »
Gravity: Quantum
Last Updated on 2009-03-25 at 20:27
Taking a clue from theories we have for the other three forces, it stands to reason that in order to create a Theory of Everything that includes gravity, we are going to have to... More »
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