The Notion Of Time Travel Through Systemic Functional Linguistics

Gribbin (1990: 248):

Conventional wisdom has it that true time travel must be impossible, because of the paradoxes involved, like the one where you go back in time and kill your grandfather before your own father has been conceived.  On the other hand, at the quantum level particles seem to be involved in time travel all the "time," and Frank Tipler has shown that the equations of general relativity permit time travel.

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From the perspective of Systemic Functional Linguistic theory, the notion of travelling through time can be seen as a category error that arises from treating time as if it were equivalent to space.  For space, there is the distinction between 'moving from here to there' and 'extending from here to there', but for time, there is no distinction between 'moving from now to then' and 'extending from now to then'.  In the case of time, both renderings construe the Extent (duration) of the unfolding of the process.