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Everything in science is theory — that's the nature of the game.
In GR, time is a fourth dimension. So to say the future doesn't exist yet is a misapprehension. The future exists - it's just we normally don't have access to points on the time axis that are farther away from "zero" than our current position.
Then there's Niven's Third Law: "in any Universe of discourse in which time travel is possible, it will not happen." :-)
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