# Gravitational Field

In physics, a gravitational field is a model used to explain the influence that a massive body extends into the space around itself, producing a force on another massive body. Thus, a gravitational field is used to explain gravitational phenomena, and is measured in newtons per kilogram (N/kg). In its original concept, gravity was a force between point masses. Following Newton, Laplace attempted to model gravity as some kind of radiation field or fluid, and since the 19th century explanations for gravity have usually been sought in terms of a field model, rather than a point attraction.

In a field model, rather than two particles attracting each other, the particles distort spacetime via their mass, and this distortion is what is perceived and measured as a "force". In such a model one states that matter moves in certain ways in response to the curvature of spacetime, and that there is either no gravitational force, or that gravity is a fictitious force.

### Other articles related to "gravitational field, gravitational, field, gravitational fields":

Gravitational Field - Generally Accepted Fundamental Hypothesis
... The detection of gravitational waves bears directly on the question of whether there is any such thing as a "gravitational field," which can act as an independent entity ... … this fundamental field hypothesis has been generally accepted without observational support ... Most scientists believe that the gravitational field and its gravitational waves are the physical interpretations of Einstein's equations of general relativity ...
Gauss' Law For Gravity - Poisson's Equation and Gravitational Potential
... Since the gravitational field has zero curl (equivalently, gravity is a conservative force) as mentioned above, it can be written as the gradient of a scalar potential, called the ... In radially symmetric systems, the gravitational potential is a function of only one variable (namely, ), and Poisson's equation becomes (see Del in cylindrical and spherical coordinates) while the gravitational ...
Two-body Problem In General Relativity
... problem in general relativity is to determine the motion and gravitational field of two bodies interacting with one another by gravitation, as described by the ... of binary stars around each other, and estimate their gradual loss of energy through gravitational radiation ... General relativity describes the gravitational field by curved space-time the field equations governing this curvature are nonlinear and therefore difficult to solve in a closed form ...
Alternatives To General Relativity - Early Theories, 1686 To 1916
... mathematics) the density of mass generates a scalar field, the gravitational potential in joules per kilogram, by Using the Nabla operator for the ... Even so, Newton's theory is thought to be exactly correct in the limit of weak gravitational fields and low speeds and all other theories of gravity need to reproduce Newton's theory in the appropriate limits ... and Arnold Sommerfeld (1910) tried to modify Newton's theory and to establish a Lorentz invariant gravitational law, in which the speed of gravity is that of light ...
Weightlessness
... Counterintuitively, a uniform gravitational field does not by itself cause stress or strain, and a body in free fall in such an environment experiences no g-force acceleration and feels weightless ... When bodies are acted upon by non-gravitational forces, as in a centrifuge, a rotating space station, or within a space ship with rockets firing, a sensation of ... In such cases, a sensation of weight, in the sense of a state of stress can occur, even if the gravitational field were zero ...

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