Saturday, 26 July 2014
(ii) A different kind of vehicle, with no agreed terminology, would move characters sideways into a different timeline, assuming that other timelines exist.
So how can a character with a mere time machine get into a different timeline? He might travel pastwards and (a) initiate a divergent timeline or (b) return futurewards, passing through the moment at which another time traveler had initiated a divergent timeline.
It follows that a time traveler cannot enter another timeline merely by traveling pastwards.