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The passing "now" moment is an illusion created by the fact that we cannot remember the future and forget the past. It is biologically advantageous to experience a now moment, but it is not at all defined by physics. Time dilation means every object has a different perception of whether events are simultaneous depending on their relative movement, making it impossible to declare any two events as absolutely simultaneous (or more importantly, not) because there is no single timeline to compare against. Therefore, there is no such thing as "now". It follows that every spacetime position is equally real, for all eternity. Yaay for relativity! Einstein realized this, he has a lot of quotes about how relativity removes the grief from death.