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quote:Originally posted by realmswalkerI donno? can anyone give an insight please (ive heard speed of light or instantaneous)
quote:So to recap, I don't understand what you are proposing.
quote:Originally posted by gsmollinquote:Originally posted by realmswalkerI donno? can anyone give an insight please (ive heard speed of light or instantaneous)The answer depends upon what you mean by "propagation". If you are refering to gravity waves, i.e. gravitons, they propagate at c. However, gravitational radiation requires a mass quadrupole moment to radiate. So there are negligible gravitons coming from the sun, since there is neglible quadrupole moment in the solar system. The earth orbits the sun about its true location, not the location we observe when we look at it (using solar filters, of course). We see photons, which radiate from the sun and take 8 minutes to get here, so we see the sun as it was 8 minutes ago. The earth orbits about the instantaneous location of the sun. No gravitons needed, the spacial curvature necessary to orbit the sun is already in place, much like a road for the earth to follow.