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<blockquote data-quote="Ponderous Curmudgeon" data-source="post: 75799514" data-attributes="member: 433179"><p>Good question in many ways but my understanding which is not sufficient to give you a complete answer is for starters, you are conflating the expansion of space ie the big bang with relativistic effects. You are also approaching from a Newtonian frame. The expansion of space is not specifically relevant to calculations of relative time/speed effects. what I believe is relevant is time dilation and how clocks are perceived by different "persons".</p><p></p><p>I started a reply earlier but could not carry it as far as you since I am not good at relativity, but I see Mark's confusion in that he is confusing the expansion of space due to the BB as relevant to the speed of light within space. He is also stuck in Newtonian thinking re speed addition vs relativistic time dilation which relates to time as seen by the observers of the oncoming things as seen by each. Your turn.</p><p></p><p>Interesting the answer I didn't post turned up anyway, deal with it as you will. <img src="data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7" class="smilie smilie--sprite smilie--sprite1" alt=":)" title="Smile :)" loading="lazy" data-shortname=":)" /></p></blockquote><p></p>
[QUOTE="Ponderous Curmudgeon, post: 75799514, member: 433179"] Good question in many ways but my understanding which is not sufficient to give you a complete answer is for starters, you are conflating the expansion of space ie the big bang with relativistic effects. You are also approaching from a Newtonian frame. The expansion of space is not specifically relevant to calculations of relative time/speed effects. what I believe is relevant is time dilation and how clocks are perceived by different "persons". I started a reply earlier but could not carry it as far as you since I am not good at relativity, but I see Mark's confusion in that he is confusing the expansion of space due to the BB as relevant to the speed of light within space. He is also stuck in Newtonian thinking re speed addition vs relativistic time dilation which relates to time as seen by the observers of the oncoming things as seen by each. Your turn. Interesting the answer I didn't post turned up anyway, deal with it as you will. :) [/QUOTE]
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