There seem to be two major theories currently.
The theory that the vast majority of people have naturally come to accept because it's the most sensible from a simplified and personal perspective is that time is constantly flowing in all places continuously ― beginning to end.
The less known and accepted theory is that every point in time exists simultaneously. To understand this, one can compare the universe to a DVD, Blu-Ray, etc. Any and all points within the movie exist on that disc simultaneously. It's simply a matter or rewinding or fast-forwarding to reach that point, and yet it moves in a coherent path on its own.
What is your view on the subject?
[spoiler]I'm writing a paper on this for my English Composition course in university. Could anyone provide links to good articles representing both sides of this debate?[/spoiler][spoiler]inb4[b]few[/b]replies[b]because[/b]stupid[b]people[/b]
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Time is the general rate if change for matter/energy, not a literal path that can be traveled. The rate can be affected by mass/gravity and speed. The past in the common science fiction sense does not exist, and is the reason you cannot travel to it.