Time Travel

The method of time travel is varied whether it be in The Doctor's TARDIS, or an old Delorean, it is mostly accepted that it will take an (unspecified) power source of a particular sort and some new kind of substance. Not too many have gone for the many dimension method though Star Trek's 'subspace' is a sort of time travel and it uses a type of space to which we currently have no access. The effect of time travel has usually been of two sorts. One where the smallest inadvertent thing changes the future completely, and the other is that time is immutable. Doctor Who suggests something in the middle; some events are fixed others, not. In a curious way this last might just be a keeper...

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