- #51

JesseM

Science Advisor

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JesseM said:Did you mean "all movement between objects of mass and light is absolute, including acceleration" to be a physical statement?

What's at the core of his theory is that light moves at c in every inertial coordinate system, or equivalently that each inertial observer will measure the speed of light to be c if he uses rulers and clocks at rest relative to himself. But your claim that "the traveler always travels at 0c relative to light" doesn't make sense in either of these terms.In fact it is the core of Einstein's relativity theory!

Again, please provide some rigorous definition--whether expressed in terms of coordinate systems or in terms of physical measurements--of what

*you*mean in general by the phrase "A is moving at velocity v relative to B", in such a way that if A=the traveler and B=the light beam, v would equal 0 rather than c. If you can't do this, then your statement cannot possibly make any sense as physics.

It's not that I think your statement is clearly wrong, it's just that I have no idea what you even mean. I would certainly agree that in theMeJennifer said:For an unaccelerated object light aways escapes at a speed of c while during the acceleration of an object this is no longer the case. Again feel free to give a situation that is in contradiction with this.

*coordinate system*of an unaccelerated object light always escapes at a speed of c, and that in the

*coordinate system*of an accelerating object this would not necessarily be the case, but you claim not to be talking about coordinate systems. So what

*are*you talking about? Surely it's meaningless to ask "how fast is the light escaping" without having in mind either a coordinate system or a physical procedure for measuring speed?

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