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What are the implications of this on freewill? Are our choices and the outcomes predetermined?Time is a fact, but it's nothing like we perceive it. In that sense, it's also an illusion.
Not as we perceive it. Past events still exist, and are just as 'real' as those we currently perceive. Moreover, there's nothing in general relativity that prevents time from 'flowing' either way. The "arrow of time" is largely in our heads.
This is an excellent, short, simplified exploration of the concept:
Also is it , in theory, possible to change the past?