Causal structure of this spacetime
The deflection of light by gravity (such as it happens in General Relativity) does not blur at all the crisp and wide boundary between the past and future shown in the figure below. We can see quite well below what region of this spacetime is contained within the boundary of the causal future of the event E, what region of this spacetime is contained within the boundary of the causal past of the event E and what regions are outside of both the past and the future of this event.
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