I read that when we travel into the past past we actually travel to a parallel universe. What is the reason? Who said that?

  • 1
    $\begingroup$ Welcome to wb.se. Please check with the Help Center (worldbuilding.stackexchange.com/help) about the questions handled here. $\endgroup$ – Alexander von Wernherr Dec 9 '16 at 12:22
  • 2
    $\begingroup$ Hello and welcome to Worldbuilding. I am sorry but I have to put a "close" vote on your question because it is not at all about building a world. Further more, the only direction is which we can do time travel is forward, and doing so is never instantaneous. The only thing we can affect is the rate at which we travel forward in time. Please look at the link provided by @AlexandervonWernherr for information on how to post a good question on WB SE. $\endgroup$ – MichaelK Dec 9 '16 at 12:26
  • $\begingroup$ Yes, I too saw this in the news recently. Here is a link to the recent announcement. $\endgroup$ – Thom Blair III Dec 9 '16 at 17:56

I haven't heard of travelling into a parallel universe when travelling into the past. But I think you may be referring to a tree like structure of time.

Every action you take, or don't take creates an instant offspring of your current universe.

So if you travel back in time, e.g. 20 minutes back and decide not to write this post, but rather check the worldbuilding wiki and help center, you'd split your universe into to separate and equal universes, one where you actually write this post and one where not. In the path where you do, this results in me sitting here, writing this post or not, on my choice, creating two equal forks of the universe.

Simply spoken.

But it's all timey wimey and wibbly wobbly stuff, to quote one of the most famous time travellers ever.

  • $\begingroup$ so when we travel past(if we can) we don't travel to parallel universe right? $\endgroup$ – Ali Ph Dec 9 '16 at 13:13
  • 2
    $\begingroup$ I've been in 2000BC, 2016 and 4093 and asked around about time travel. Yet, no one knows exactly if and how it works. We have to wait. $\endgroup$ – Alexander von Wernherr Dec 9 '16 at 13:15
  • $\begingroup$ But I can prove that when we travel past we travel to parallel universe $\endgroup$ – Ali Ph Dec 9 '16 at 13:18
  • $\begingroup$ Feel free to post your prove here: physics.stackexchange.com Because then we're talking physics, physics, physics (Ok, enough Doctor Who quotes for today) $\endgroup$ – Alexander von Wernherr Dec 9 '16 at 13:20
  • $\begingroup$ I wanted to do that but they said this isn't an appropriate physics question $\endgroup$ – Ali Ph Dec 9 '16 at 13:22

Not the answer you're looking for? Browse other questions tagged or ask your own question.