Astrophysics: 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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Featured Article
Gravity: Canonical Quantization
Introduction The second program called 'Canonical Quantum Gravity' theory has a very different parentage. Following the established mathematical techniques developed by Schroedinger and Dirac,...
Articles
Introduction During this century, the search for a theory of quantum gravity has followed one or the other of ...
What is Gravity? There are many articles here in the Encyclopedia of the Cosmos focusing on various aspects of...
Introduction In the spirit of the Nordstrom-Kaluza-Klein theory which involved adding a 5th dimension to space...
Introduction Apart from the ambiguous experimental evidence that gravitational radiation exists but its quanta...
Introduction The work by Max Planck on the blackbody spectrum, and by Albert Einstein on the photoelectric eff...
Unification There is also the question of just what is meant by unification. Is it sufficient for all fields t...
Introduction String theory does not do away with the need for some kind of background spacetime. The equations...
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