Ian,
I really don't know what else I can say which hasn't already been said. The 2 spheres maintain their distance from each other. There is nothing else in the Universe apart from space itself. So we could only conclude they are orbiting each other through physical effects such as centrifugal force. But that's kinda like a logical contradition.
Kinda like a logical contradiction? Where is the logical contradiction?
Any physical effects say they are orbiting around each other. Yet they cannot possibly be orbiting around each other. Not without introducing the notion of absolute space which is incoherent nonsense.
You are talking out of your ass. It is not, in any way, necessary to introduce the notion of absolute space. There is more to the system than just the relative positions of the two spheres. You are, once again, applying your notoriously circular logic. You claim that the two scenarios are indistinguishable, and then when we point out that they are not, and how they could be distinguished by things like red-shift, length-contraction, and deformation do to centrifugal force, you assert that none of those effects are present. When asked why not, you claim that they cannot be because the two scenarios are equivalent.
The sad thing is, I don't think you even comprehend basic logic well enough to realize that this is fallacious.
This is why they cannot be any physical effects and thus relativity cannot be applied. So you and Stimp talking about what relativity predicts is a complete and total irrelevancy. You see?
Relativity is irrelevant? Correct me if I am wrong, but didn't you bring up this sphere nonsense as an example of how materialism treats indistinguishable objects? Are you now suggesting that materialism does not predict that your sphere example will function according to general relativity? If so, then it is you who are spouting off relevancies, not I.
Relativity predicts that if the two spheres are not rotating about each other, they will fall towards each other at a certain rate; if we find that they do fall at that rate, then we say they are not rotating. Relativity predicts that if they are rotating about each other at a certain rate, the distance between them will remain constant; if we find that the distance between them does remain constant, we say that they are rotating.
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And I don't care what relativity predicts since it results in the absurd notion of an absolute space which is nonsensical. If I believe that a material world is nonsensical I'm scarcely likely to embrace the concept of an absolute space!
So you admit it! You presented a thought experiment about materialism, but applied to it your own assumptions about what would happen, and not those of materialism. Thus your thought experiment says
absolutely nothing about materialism. It just indicates that materialism is not compatible with your own ill conceived views of how things work.
Relativity dismisses the idea of absolute velocity; it doesn't dismiss the idea of absolute acceleration.
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Right, and relativity must apply even if there were only one object in the Universe. So it must make sense to suppose that one object is in absolute acceleration.
No. As usual, you have no idea what relativity actually predicts.
Going off topic a littel bit, does the existence of absolute acceleration explain the fact that in the twin thought experiment it is the one on the earth who has aged more than the one on the spaceship? Must do mustn't it?
No. That "paradox" can be resolved without any references to general relativity at all. The apparent symmetry which seems to lead to the paradox, is broken by the fact that the experiment begins, and ends, in the reference frame of one of the twins, and not the other.
BTW did you know that Newton was convinced that the existence of an absolute acceleration vindicated the notion of an absolute space?
Newton was convinced of a lot of things that were not true. So what?
Tommy,
(Perhaps I should back and listen to my Eminem CD - or, God forbid dad's Jethro Tull DVD)
Blah! Ditch all of that crap. What you need is some good old-fashioned Heavy Metal. Start yourself off with some soft and melodic, like Iron Maiden or Black Sabbath, and then work your way up to stuff like Slayer and Pantera.
Dr. Stupid