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Everybody knows that two events , A and B, can happen at the same time for an observer but at different times for an other one
I'm by no means an expert, but there might be a difference between experiencing time (and our theoretical ideas) and what actually happens, because this doesn't sound that obvious. Basically it comes down to time stretching at extremely high speeds? Does it really 'stretch' or are we experiencing it as if it's stretching? According to Einstein time is relative, but does this mean time "itself" (time-space symmetry) or the experience of it? He always seem to have given examples of the latter.
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Most people suppose that this is evident just in case the relative speed is close to the speed of the light
Actually the two observers could experience the same situation, in theory of course, even though their relative speed is quite low provide their distance is huge
I think the problem with high speeds and huge distances is that measurements become very inaccurate pretty quickly. Perhaps it's simply the equivalent of an 'optical illusion' (but a truly physical one), but then one that has to do with the time-space symmetry instead of visual things?
Cheers
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