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Originally Posted by RussT
He did NOT synch clocks correctly here, he justs says they are synched...if you followed my 10 light second seperation of two observer's A and B above, this is very easy to figure out! Fifth Grader stuff...
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Originally Posted by tusenfem
Just because it takes time to go from A to B does not mean that the clocks are not ticking at the same rate with the same T=0. Apparently, you might have to return to the fifth grade. Please spell us out what exactly your problem is here up to now you have only written stuff that is not in the least interesting.
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Quote:
Originally Posted by NothernBoy
Now, you have just stated that we have an event at observer 1 when his clock reads zero. Observer two sees this when his clock reads 2.5 million years, but what of it? He notes this, notes that observer 1 is 2.5 million light years away, and concludes that observer one would have seen it when observer 1's clock read zero.
Given that he knows that the clocks are synchronised, he can go further, and say that, for obserer 2, the supernova happened at T=0 also.
Both observers agree that the supernova happened at T=0, on both of their clocks. How on earth does this invalidate any synchronisation?
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Because here is how this "Really" goes!!!
The light from the Halfway light source hits both M31 and the Milky Way observers simultameously, setting each observers clock to 0, and right when the beam hits the M31 observer, the SN explodes, so our clock and his clock are BOTH 0 when the SN explodes, and Then it takes 2.5 million light years for the light from the SN to reach us. No fifth grader remark needed...