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So Were A Lot Of Geniuses In The Past

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Posted by Aurino Souza on November 5, 2002 19:16:21 UTC

Hi Bruce,

Even though that was a fine answer, could you please elaborate on what's wrong with this quote from Van Flandern's website:

Indeed, it is widely accepted, even if less widely known, that the speed of gravity in Newton's Universal Law is unconditionally infinite. (e.g., Misner et al., 1973, p.177) This is usually not mentioned in proximity to the statement that GR reduces to Newtonian gravity in the low-velocity, weak-field limit because of the obvious question it begs about how that can be true if the propagation speed in one model is the speed of light, and in the other model it is infinite.

The same dilemma comes up in many guises: Why do photons from the Sun travel in directions that are not parallel to the direction of Earth's gravitational acceleration toward the Sun?

Why do total eclipses of the Sun by the Moon reach maximum eclipse about 40 seconds before the Sun and Moon's gravitational forces align? How do binary pulsars anticipate each other's future position, velocity, and acceleration faster than the light time between them would allow? How can black holes have gravity when nothing can get out because escape speed is greater than the speed of light?


Seems to make sense to me. Of course it may be because I don't understand GR either, but since you do would you be so kind as to explain what's wrong with the quote?

Respectfully,

Aurino

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