Time travel hasn't been invented yet. Which sucks:< Who wouldn't want to change their past mistakes. What if it has been invented in the future and people do travel back. However, every time they change something, however minute, an alternate reality is created and the one that we exist in isn't changed. Could this be why, we haven't been visited by time travelers from the future?

P.S. I am asking this because of this Article here. And yes, I do know that by the rules of physics, time travel backwards isn't theoretically possible.


closed as off-topic by MichaelK, JDługosz, Josh King, Hohmannfan, Frostfyre Aug 28 '16 at 17:32

This question appears to be off-topic. The users who voted to close gave this specific reason:

  • "This question does not appear to be about worldbuilding, within the scope defined in the help center." – MichaelK, JDługosz, Hohmannfan
If this question can be reworded to fit the rules in the help center, please edit the question.

  • $\begingroup$ pretty sure this is a duplicate, but I am too lazy to find it $\endgroup$ – TrEs-2b Aug 28 '16 at 10:56
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  • $\begingroup$ Hello and welcome to Worldbuilding. Unfortunately I have to vote to close your question because it is not actually about building a world, as detailed in these nifty guidelines: worldbuilding.stackexchange.com/help/how-to-ask Please read through those, and you are most welcome with any other question you may have, on building worlds. I would also suggest to post this particular question in the Physics or Philosophy Stack Exchange, because those are more appropriate areas for this kind of questions. :) $\endgroup$ – MichaelK Aug 28 '16 at 11:02
  • $\begingroup$ Since this is WorldBuilding, and there are no internal logical holes in your question, it seems like you've answered your own question. It may be useful for you to think through the implications of that and see if you have a question that is more in the bounds of WorldBuilding. "If time travel only makes branching timelines then what's the point" isn't right either... But if you put a little thought into it I'm sure you could think of something that we could help you with. Welcome to the site! $\endgroup$ – AndyD273 Aug 28 '16 at 12:03
  • $\begingroup$ This is under the assumption that we are on the first branch. If we aren't then the could be why we have been visited by time travelers from the future, but we don't believe them. $\endgroup$ – Theraot Aug 28 '16 at 12:29

There is another possibility, Niven's Law of Time Travel

If the universe of discourse permits the possibility of time travel and of changing the past, then no time machine will be invented in that universe.

Every trip to the past changes the timeline. "Sooner" or "later" some bozo will make a change in the past which will result in time travel not being invented. That timeline will be stable, since no one goes back to alter the past.

  • $\begingroup$ interesting point! $\endgroup$ – Luciferangel Aug 28 '16 at 13:13

Hypothetically if time travel worked the way you described, we would never know that time travel existed. Every time someone from another time arrived in our time a new branched history would be created and our present would remain unchanged.

But that's basically what you said in your question any way. This is somewhat tautological.

There are,of course, many other objections to time travel such that if it existed we would never know about it. Which is, probably, a good thing.


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