Travel back? Highly doubt it. I don't see how you could possibly make it so that YOU can go back in time to witness things that have already happened. For example, "I want to see the time when dinosaurs existed." It's passed, those pieces of energy have moved on to form other things. Theoretically could you if you bent spacetime enough to bypass blah blah? Sure, but good luck doing that. Works well enough on paper, but actually following through with putting someone back in time probably won't ever happen.
Forward in time? Sure. Go the speed of light and time comes to a crawl. 2 seconds to you means that YEARS have passed on the outside. Seems a lot more realistic than going back.
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