I think at this point it is worth waiting to see what a cosmologist thinks.
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'c' is a variable in that it is is observer dependent.
My understanding is that this is not the case. The theories of special and general relativity are built around the concept that all observers agree on c, no matter what reference frame they are in...
I'm wondering Chiral. This is collected thoughts on 'c' as a variable. http://www.ldolphin.org/cdkconseq.html
with a time dilation you could argue that 'c' changes too, from the 'eyes of a God' so to speak. See if you can find something interesting
The nearer an object's velocity gets to the speed of light, the effects will start to resemble the tidal forces on an object approaching a black hole. Since the forces holding the object together themselves travel at light speed this has to be the case. Otherwise relativity breaks down.QuoteReported in November 1994 in Monthly Notices of the Royal Astronomical Society is a galaxy with a measured red shift of z=4.25 , a new record. This value for the z parameter corresponds to a recession speed of .93c. but I haven't noticed any change in my structural integrity.