> At what "speed" does gravity exert its influence?
it takes approx 8 minutes for light from the sun to reach us
now that light wasn't aimed at the Earth when it left the sun
the sun puts out light in all directions and the Earth intercepts
light that was shot out ahead of it. think of it like a shooter
trying to hit clay pigeons, you shoot where you think the object
will be, not where it is when you shoot.
but gravity from the sun isn't like light from the sun
the sun puts out light whether there's anything to receive it or not
(the light will just keep on going outward)
but gravity only occurs when there are two objects
Gravity is one of the fundamental forces of physics. The most important aspect of gravity is that it is universal: all objects have a gravitational force that attracts other objects to them. The force of gravity acting on any object is dependent upon the masses of both objects and the distance between them.
and that connection is "instantaneous"
otherwise the calculations won't work
The most amazing thing I was taught as a graduate student of celestial mechanics at Yale in the 1960s was that all gravitational interactions between bodies in all dynamical systems had to be taken as instantaneous. This seemed unacceptable on two counts. In the first place, it seemed to be a form of “action at a distance”. Perhaps no one has so elegantly expressed the objection to such a concept better than Sir Isaac Newton: “That one body may act upon another at a distance through a vacuum, without the mediation of any thing else, by and through which their action and force may be conveyed from one to the other, is to me so great an absurdity, that I believe no man who has in philosophical matters a competent faculty of thinking, can ever fall into it.” (See Hoffman, 1983.) But mediation requires propagation, and finite bodies should be incapable of propagation at infinite speeds since that would require infinite energy. So instantaneous gravity seemed to have an element of magic to it.
Conclusion: The Speed of Gravity is ³ 2x1010 c
not instantaneous but really really fast
the confusion of thinking that electromagnetic waves (light) and gravity are similar
lies in the fact that both light and gravity follow the inverse square law
(the consequence of both originating from spheres)
Edited 1 time(s). Last edit at 10-Feb-16 15:05 by laughin.
|Can we create a vacuum devoid of dark matter?||920||laughin||07-Feb-16 15:29|
|Re: Can we create a vacuum devoid of dark matter?||288||Eddie Larry||08-Feb-16 15:11|
|Re: Can we create a vacuum devoid of dark matter?||317||laughin||08-Feb-16 20:32|
|Re: Can we create a vacuum devoid of dark matter?||258||Eddie Larry||08-Feb-16 22:38|
|Re: Can we create a vacuum devoid of dark matter?||243||laughin||09-Feb-16 15:20|
|Dark matter and "gravity 2"||324||David L||09-Feb-16 16:34|
|Is dark matter a second type of gravity?||295||David L||09-Feb-16 16:38|
|Re: Is dark matter a second type of gravity?||329||laughin||09-Feb-16 20:24|
|Re: Is dark matter a second type of gravity?||277||randompHactor||09-Feb-16 22:42|
|Re: Is dark matter a second type of gravity?||370||laughin||10-Feb-16 14:27|
|Re: Is dark matter a second type of gravity?||271||randompHactor||10-Feb-16 15:09|
|To Infinity and Beyond!!!!||360||laughin||15-Feb-16 14:36|
|circular reasoning as mental masturbation||360||laughin||18-Mar-16 15:48|