![]() Our observable present is carried along through time like a stick floating on a river. Then there's a stretch of time where it stood abandoned in a shed or similar - no interaction, no travelling. ![]() There's a stretch in time where it was regularly interacted with - perfect for travelling. a day where it was purposely thrown at something, a day where it was used in a sandcastle, a day where it became part of the wall of a house, etc).Ī good example for a temporally limited object might e.g. While said pebble might have huge gaps between the possible targets (e.g. the Mona Lisa will allow travelling to almost any date and moment in time since it's creation. The historical/cultural significance of a reference object is determined by the interactions of sentient/feeling/whatever beings that have been had with it. a painting by Leonardo da Vinci would be as perfect a reference core as they come and allow pinpoint accuracy. While a pebble or rock can bring you back millions of years, the machine will easily drift off the target time by tens of thousands of years due to the insignificance of the chosen reference core. The more historically/culturally significant a thing is, the better it works for time travel. The time-machine's dependent on its reference core, a thing from the past that can be dated back to a certain period or even point-in-time (e.g. Rather than being like an aircraft's range limit, it's like an aircraft's service ceiling.Įdit: No, the time limit wasn't the date the time machine was made it was always something far in the past. And it's not that there's some barrier in time affecting all time travel: a newer, more advanced time machine could go back to an earlier year. It's not "can't jump back more than 100 years at once." It's "can't get me to a time before 1919, regardless of when I jump from." And no, these aren't time machines that stay at their starting point and launch you to another time they're your much-more-common-in-fiction time machine that's a vehicle, leaving no physical object behind. (It might have a similar limit in the future.) Note this isn't a temporal range limit. But is there any (pseudo)scientific justification for this?Ī time machine is limited in how far back in time it could go. None of us knew why we abstracted that as stuff the characters knew. I was once in a roleplaying campaign where time machines had this odd quality.
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