Since light speed is finite, there are regions in space-time (outside the light cone) with no causal relationship to you at the origin. (If a tree falls in the forest and nobody is around...)
Thanks for the insight, indeed a tilted plane is a reference frame with a velocity whereras flat is stationary. What do you mean about general relativity?
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I mean that, to the best of my (very limited) knowledge, there is no coherent way to define “simultaneous” for distant events under GR, and the best you can do is “spacelike separated” (not in each others’ lightcones).
Thanks. Twitter will use this to make your timeline better. UndoUndo
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