I get that there are 3 dimensions of space and only one dimension of time, but it still seems like you should be able to go both forward and backward. It’s like if you had a 1-dimensional space (which I assume would be an infinitely thin line, correct me if I’m wrong) you could still go both left and right.
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Time isn’t a ‘dimension’ in which we can travel, in the generally-accepted sense of ‘height/width/depth’. Calling time a dimension is an abstraction, used to illustrate the passage of time.
We can’t go backward in time, because there’s no ‘backward’ involved; there’s really no ‘forward’, either. We’re always and forever ‘now’, and what we *perceive* as the passage of time is simply our observation of the effects of entropy on a physical universe.
To speak of your 1-dimensional line: if it’s infinitely thin, then any attempt to travel along that line is meaningless — there’s literally nowhere to go. If time were an infinite 1-dimensional space, then again, there’s no point to travel, because there’s no destination that anyone could possibly reach.
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