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But if we will time travel, then haven't we already time travelled?
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Yeah, that is kind of one of the eternal problems with time travel. One argument is that once it has been invented, it has already been invented/existed at every point in history.
Or, if that isn't the case, then once it is invented, the furthest back you can travel is to the point it was invented. So, if it was invented in 2010, then suppose in the year 2034, you could only travel back as a far as 2010.