Plushophile wrote: ooo...dejavu wrote: If time travel is possible in the future, wouldn't we have been visited by people of the future today to tell us?
Not if they can only go forward in time.

Or if they only have visited another part of the future (eg. a time ahead of us NOW, behind them THEN).

Or just didn't bother to tell us.

oSSkar wrote: Plushophile wrote: ooo...dejavu wrote: If time travel is possible in the future, wouldn't we have been visited by people of the future today to tell us?
Not if they can only go forward in time.

Or if they only have visited another part of the future (eg. a time ahead of us NOW, behind them THEN).

But if at any point in our future time travel (in both dirrections) is discovered, where people of the future then return to the past to tell us and share the technology, all people of the time after which they return would be aware of this.
Time travel gives me a headache!

zgodt wrote: I heard a radio story a few weeks ago about a theoretical physicist in the U.S. who has devoted his life to this question, and has built an experimental prototype of a time machine, with some minor promise possible in early tests (they may be able to send certain particles backward in time a short distance, or something). But even if this machine was wildly successful and a functioning, large-scale version was built, big enough for a person to use, they still would only be able to go back in time to the point at which the time machine was built. So nobody's going to be visiting the pleistocene era anytime soon.

Anyway, the radio story about the guy is awesome. His dad died when he was a kid, and he has spent the rest of his life obsessed with the idea of traveling back to see his dad again. You can hear it at this website: http://www.thislife.org/pages/archives/archive07.html

Scroll down until you find this episode:

My Brilliant Plan
1/26
Episode 324

That almost sounds like The Time Machine.

oSSkar wrote: Plushophile wrote: ooo...dejavu wrote: If time travel is possible in the future, wouldn't we have been visited by people of the future today to tell us?
Not if they can only go forward in time.

Or if they only have visited another part of the future (eg. a time ahead of us NOW, behind them THEN).

Or if they visited, for instance, yesterday, when we're living in today.

... I don't know how that works, but isn't that what this thread is all about?

Анорфосэкс wrote: oSSkar wrote: Plushophile wrote: ooo...dejavu wrote: If time travel is possible in the future, wouldn't we have been visited by people of the future today to tell us?
Not if they can only go forward in time.

Or if they only have visited another part of the future (eg. a time ahead of us NOW, behind them THEN).

Or if they visited, for instance, yesterday, when we're living in today.

... I don't know how that works, but isn't that what this thread is all about?

Yes. I would like to create a nesting of time trips where I visit myself so that there are eventually millions of 'me' to take over the world. E.g., I travel back twenty years and hang out with myself for twenty years. Then, myself and myself-twenty-years-thence travel back to that same moment in time. Now there are 4 of us: myself, 2 of myself-twenty-years-thence, and myself-twenty-years-thence-plus-twenty. The next trip would involve the four of us, yielding:

myself
4 of myself twenty-years-thence
2 of myself twenty-years thence-plus-twenty
myself twenty-years-thence-plus-twenty-plus-twenty

The fourth trip would create:

myself
8 of myself twenty-years-thence
4 of myself twenty-years thence-plus-twenty
2 of myself twenty-years-thence-plus-twenty-plus-twenty
myself twenty-years-thence-plus-twenty-plus-twenty-plus twenty (maybe, this is me at 120 years old)

So on and so forth, until there are as many of the 'myself twenty-years-thence' as necessary to simply take over the world and elect the youngest version of myself as ruler. Of course, every twenty years I continue traveling back in time to ward off any other dopes stealing my idea.

http://www.yikers.com/video_guy_proves_he_has_time_traveled.html
is the swede lying?

Tehz0mqz wrote: http://www.yikers.com/video_guy_proves_he_has_time_traveled.html
is the swede lying?
I doubt it's a coincidence that the videoclip from the future is filmed against the light, making it impossible to recognise the face of the old dude.

Plushophile wrote: Tehz0mqz wrote: http://www.yikers.com/video_guy_proves_he_has_time_traveled.html
is the swede lying?
I doubt it's a coincidence that the videoclip from the future is filmed against the light, making it impossible to recognise the face of the old dude.

Isn't that just his holy futur glow?

As fa as I understand it thus far (2nd Year of a Physics degree), MattBarlow has hit it on the head with the 2nd Law of Thermodynamics preventing reverse time travel. But then this leads us to wormhole theory and such that I've only touched upon and don't know anything about. And travelling at the speed of light is impossible for anything other than massless objects. (Again this is all as I understand it - if anyone knows more than me on the subject, please correct me!)

i just read that in a reality with absolut spacetime, there is no now. Every moment of time exist equally. So we could just chose a point in the 4th dimension we would like to experience aaand! - Vola! Timetravel!

I was thinking, don't we timetravel all the time, every second of our life? I mean, if time is a linear forward moving module, then that's the case right?

zgodt wrote: I heard a radio story a few weeks ago about a theoretical physicist in the U.S. who has devoted his life to this question, and has built an experimental prototype of a time machine, with some minor promise possible in early tests (they may be able to send certain particles backward in time a short distance, or something). But even if this machine was wildly successful and a functioning, large-scale version was built, big enough for a person to use, they still would only be able to go back in time to the point at which the time machine was built. So nobody's going to be visiting the pleistocene era anytime soon.

Anyway, the radio story about the guy is awesome. His dad died when he was a kid, and he has spent the rest of his life obsessed with the idea of traveling back to see his dad again. You can hear it at this website: http://www.thislife.org/pages/archives/archive07.html

Scroll down until you find this episode:

My Brilliant Plan
1/26
Episode 324

I read an article once where a Russian physicist or professor or whatever explained that space time wasn't linear, but.. uh.. can't remember the word, but it's like a sideways U. And he argued that it would be technically possible to travel from one point in said sideways U to another. I also read a short article once about tests that were done in the US where they were trying to send small items back in time. I think the article said something about there being a theoretical possibility of sending a human back in time, but it would require massive amounts of energy, and the labs that were doing the tests didn't have access to such high levels of energy.