can gravity effect gravitational fields?

[dazzlepecs]

Sorry if this is a dumb question. We are arguing something on a bodybuilding forum lol


for example the sun gravity morphing the effect of the moon



And if so, would that mean that gravity must have a >>c velocity to escape a black hole?

[superluminal]

YEs.

[shalayka]

Sorry if this is a dumb question. We are arguing something on a bodybuilding forum lol

for example the sun gravity morphing the effect of the moon

And if so, would that mean that gravity must have a >>c velocity to escape a black hole?

The gravitational field does not have to escape from itself. All changes in the gravitational field propagate at v = c.

If the Sun were to veer off to the side for some reason, we on Earth wouldn't see that change until about 8 minutes later, since light travels at a limited v = c. Imagine that same type of change for the gravitational field. Only about 8 minutes later would the Sun's gravitational pull (direction and/or strength) change to reflect the Sun's new position.

The change in the Earth's position and velocity over time caused by the Sun's gravitation causes changes in the gravitational field surrounding the Earth, which changes the way it gravitates the Moon, etc. etc. It is all a very non-linear network of relationships all happening at the same time.

In a binary star system, the acceleration of each star can be so sudden and violent that a stream of gravitational energy is bled out of the system. Momentum is lost over time, the orbits continually reducing in radius, and so the stars eventually collide. The violent changes within the gravitational field during this type of event are hoped to present direct evidence of gravitational waves.

[kaneda]

I presently tend to look on gravity as dimension zero, where it pulls an object in an unknown direction towards it's centre of mass. The Earth is a stable mass, so cannot collapse under gravity but it is forever falling towards it's own centre, in a way we see as a rotation. Like all massive objects in space.

The Sun also pulls at the Moon beyond it, which may be responsiuble for it's rotation around the Sun, as it is responsible for the Moon's rotation around the Earth.

As gravity is not a particle or a wave but just a pull, it is not affected by itself as in a black hole. The effect of the pull propagates at light speed.

[dazzlepecs]

thanks guys