Time Travel/Paradoxes

[NoZKeY]

SoulBlazerFan wrote:

NoZKeY wrote: inferiare wrote: Time travel can theoretically be possible. It's been theorized that if you were to get yourself directly into the middle of a black hole traveling at the speed of light you may be able to traverse time. I think you don't need to get into a black hole. You just need to travel at a speed close to the speed of light. That's not actual "time travel." If you move at the speed of light, time would literally stop all around you- when you slowed to a normal speed, you would actually be older than anyone else around you... or is it the other way around? I can't remember.

The other way, time goes slower at a higher speed, relatively.

[psychokind]

SoulBlazerFan wrote:

psychokind wrote: SoulBlazerFan wrote: psychokind wrote: wasn't there something with past, present and future all going on simultaneously? kyle reese travels back to make his son, the future can't exist without the past being visited by the future, the present can't go on if the future didn't assure its existence by making sure that in the past the pasts present makes way for their future by making john connor? Well, think about this for a minute. There had to be a time when there was no machines in the past. Judgment Day happens with no pre-knowledge of that future. So, in the present, another man has to be John Conners father in order for that future to exist. It's after this timeline, as I said before, John Conner A sends Kyle Reese back because of the time displacement of First T-800 that was sent back to 1984. In this timeline, Kyle Reese becomes father of John Conner B, who may or may not be identical to the original John Conner of timeline A. So this John Conner would have complete knowledge of the past, the future, of who Kyle Reese would be. This timeline would then be a complete loop, going on forever and ever. I know what you mean, but as we can see in Terminator 4, there is no way the judgement day can be prevailed, and the judgement day happens because of all the people/machines who come to the past. future john connor knows about this and sends back all the guys to the past anyway. this would mean the future and past exist parallel to each other. while people from the future come to the past, everything is already set and is part of the past. nobody in the future can do something to alter his current present. Then that would entirely negate the line, "There is no fate but what we make for ourselves." If what you say is true, then no matter what, John Conner cannot die. In more realistic terms, someone could go back, put a gun to Conners head- and he would not die, due to the fact that fate is inevitable. Thus, fate and destiny would be proved, and there is no way to alter the past. I still think there had to be a "first" timeline. I'm drawing up a diagram to show this point.

no need for that, I understand your point and it's a common theory about time traveling. I just wanted to show another explanation

about John Connor cannot die: absolutely. if someone could go back, put a gun to connors head, something would happen that he doesn't die. and this would already something important for the coming future.

like you said, this would mean there's an ultimate fate, and no action we do know could alter the future, even if we come from it and know about it.

a good example: in terminator, john connor sends kyle reese back, knowing about what will happen. he could say "I'm here, so if I don't send him back, what's the worst that could happen?". but he doesn't, and whatever his reasons are, the reasons are nothing he has an influence on. it's not a decision, it's inevitable that he sends kyle reese back.

[Yet One More Idiot]

SoulBlazerFan wrote:

That's not actual "time travel." If you move at the speed of light, time would literally stop all around you- when you slowed to a normal speed, you would actually be older than anyone else around you... or is it the other way around? I can't remember.

Actually that is the other way around - the faster you go, the more YOUR time dilates relative to the rest of the universe; everything else seems to go by really fast around you.

In fact, here's a little thought experiment. Imagine you're standing outside your house, and you start running really fast. Everyone will see you running really fast. Now imagine you accelerate to a sizeable chunk of lightspeed, say, 20%. Time dilation is still pretty small (Lorentz factor is 1.02), , so everyone around you appears to be moving normally still; from their viewpoint, you're moving at 20% lightspeed/1.02 (=19.6% lightspeed), wihch is way too fast to see.

Now, you continue accelerating, still running down the road, and you reach very close to the speed of light, say.... 99.99% or something. Now the Lorentz factor is 70.7. For every second that you're running along, you see the people around you moving about at 70 times normal speed, doing whatever would take them about 1min10secs to do.
They are seeing you running at 99.99/70.7 % lightspeed, or in other words....1.41% of light.

At such a high velocity, for every second you experience, the rest of the world is experiencing 1 minute and 10 seconds, so you age really slowly, and consequently you also appear to age 70 times more slowly. And the velocity they measure you as having is 70 times lower than your actual velocity. As you approach 100% lightspeed, they see you coming to a dead stop; you'll move too slowly to see, your aging process practically halted from the point of view of everyone else; you'd effectively appear to be in stasis.

So, how do you put someone into stasis? Move them at the speed of light.

[/SUPER-NERD!]

[EverPhoenix]

Yomi's Evil Twin Intern wrote:

SoulBlazerFan wrote: That's not actual "time travel." If you move at the speed of light, time would literally stop all around you- when you slowed to a normal speed, you would actually be older than anyone else around you... or is it the other way around? I can't remember. Actually that is the other way around - the faster you go, the more YOUR time dilates relative to the rest of the universe; everything else seems to go by really fast around you. In fact, here's a little thought experiment. Imagine you're standing outside your house, and you start running really fast. Everyone will see you running really fast. Now imagine you accelerate to a sizeable chunk of lightspeed, say, 20%. Time dilation is still pretty small (Lorentz factor is 1.02), , so everyone around you appears to be moving normally still; from their viewpoint, you're moving at 20% lightspeed/1.02 (=19.6% lightspeed), wihch is way too fast to see. Now, you continue accelerating, still running down the road, and you reach very close to the speed of light, say.... 99.99% or something. Now the Lorentz factor is 70.7. For every second that you're running along, you see the people around you moving about at 70 times normal speed, doing whatever would take them about 1min10secs to do. They are seeing you running at 99.99/70.7 % lightspeed, or in other words....1.41% of light. At such a high velocity, for every second you experience, the rest of the world is experiencing 1 minute and 10 seconds, so you age really slowly, and consequently you also appear to age 70 times more slowly. And the velocity they measure you as having is 70 times lower than your actual velocity. As you approach 100% lightspeed, they see you coming to a dead stop; you'll move too slowly to see, your aging process practically halted from the point of view of everyone else; you'd effectively appear to be in stasis. So, how do you put someone into stasis? Move them at the speed of light. [/SUPER-NERD!]

but... good luck doing that. assuming you can sustain 99% of the speed of light, you have to go somewhere. the acceleration involved in changing direction so you can get your hands on them later is intense. youd get less of a stasis effect and more of a human pancake effect.

its like that riddle with the identical twins, one of which was sent into space for 20 years on a return trip travelling at almost lightspeed. i dont remember the moral of the story, but it wasnt that she returned barely aged.