>>13368555Ah, OP, let us take two time travel possibilities;
(1) no limitations
that means that once it is discovered it will then always have been available (in effect), making it a discovery
(2) with limitations
e.g. "what has happened stays happened" or some multiverse whotsit (see 'the trousers of time') or (and this is my favourite) that
.
time travel takes an amount of energy proportional to the distance in time travelled (as normal time moves on, travelling back would take more energy than going forward) thereby severely limiting timetravel (back, anyway)
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which would be more a matter of invention than of discovery (as it would be harder to get things to work).
