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It may seem impossible when you think about it, but it's undoubtedly a little more complex than that. I understand what you're saying... time is an abstract idea with little relevance other than human perception of the universe. But I don't think that's any reason to say time travel is entirely fantasy. There's too much we haven't discovered and don't understand... at the most, you could say time travel in the basic sense of the idea is improbable, but not entirely impossible. There's lots of different ways of looking at it.
If you accept the idea that our future isn't predetermined, that we're capable of affecting what will happen a minute, an hour, or a century from now, then time travel into the future seems fundamentally flawed... you can't witness something that hasn't been determined and carried out yet. But I'm sure you've heard of the twin paradox... it's the idea that if a person travels in space at a distance close to the speed of light, when they come back to Earth, what will have seemed like a short amount of time to them would in actuality be a much longer period. They will have aged much slower than their hypothetical "twin" on Earth. This is caused by the time dilation effect of relativity.
So I think it's safe to say we'll never be able to step into a machine, turn to the dial to any year we want, and instantly travel there. But time travel on a much smaller scale does seem entirely possible if we can learn to manipulate certain aspects of quantum mechanics, for example use this time dilation effect to our advantage. Where there's a will, there's a way.
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