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Talk:Gravity

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Any object with mass will exert a gravitational force on any other massive object. It is the weakest of the four forces, but results in very large effects due to the high total amount of mass in the universe and the long range of the gravitational force.
In the Einsteinian model (set out in the theory of General Relativity), gravity is the result of a mass curving space-time. Since all matter moves along the path of least resistance (called a geodesic), the presence of a curved space-time surface results in a non-straight line geodesic and therefore an apparent force.
A quantum model of gravity has yet to be established, but it is theorized that the gravitational force is transmitted via a particle called the graviton.
In fact, gravity only seems to pull downwards because we live on the surface of a very large sphere. The force pulls toward the center of the mass (in this case the Earth) and so seems to pull downwards at the Earth's surface.
This started him thinking about why gravity appears to only act downwards and so led him to rework Kepler's laws into the classical model.
The idea that gravity requires some form of rotation is a common misconception that results from a confusion about the Earth spinning and being a gravitational attractor. No spin is necessary for a mass to exert a gravitational force. A spinning object causes effects similar to gravity via inertia and this principle can be used to mimic gravity in space. However the causes and the details of the effect are quite different from true gravitation.

None of it is cited and none of it has to do with star trek. --Alan del Beccio 21:48, 7 January 2008 (UTC)

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