You mean I already rollback the time when I go back to my past? At which point the future no longer exists thus there's no need to make any changes in the future right?
Ah yes, that's another scenario which I have thought of long time ago. But calling that time-travelling is stretching it. It's more like reversing back everything in time except me and my time machine, and probably already expended all the energy it required there and then. Haha I think this is getting too fantastic to think about.

Maybe we should start defining what is or the different types of time-traveling.
Keeping back to the original topic, I'm more interested on the time dilation theory.

download full documentary, of the 1st post

http://www.megaupload.com/?d=75HNM4LN

no password.. must watch

cant seem to download. dunno y.. but is ok..

wana ask lik wat tgrr asked..
do u mean travel with the time machine where everyone else is not?

wel, i think if based on physics, it is possible.

but, realisticly.. how r we gonna make that machine thing?? n how to test it out??

if u r saying the twins who travelled n so on right.. it is applicable here also wert.. malaysia and new york have different time zone. eg, today is my bday.. i fly to new york, oh, is my bday too!

i really like science topics. and wanna post alot of my ques but scare gold fries put one big cross there so i reply here first.

anyways, i think UFOs r from other planet, not future. for eg, we are living on earth. there are so many planets we have not discover. mayb they have another earth-like!!

I was thinking, is that even possible? I mean, if there is really a time machine, it has to be travelling at the speed of light. We human can only sustain maximum 9 gravity force and imagine if we are travelling at the speed of light, can we even stand the gravitational force?

good point. gravitational..

wel, i think if one really wanna travel as like the speed of light, one gotta divide themselves til atoms..

then,another ques.. how to join it back.. haha. but how to divide ah

BlueWind: speed =! force, and neither is it proportional. you're confusing acceleration and velocity

e.g. astronauts travel at some really high speed in the ISS (20,000 km/h or something relative to the surface of the Earth) but they're virtually weightless in the ISS

Haha, ok my bad sorry about that maybe I just don't fit into this discussion after all because of my shallow knowledge. I'm saying all this because I'm studying a subject related to this so ya.

Truth is, from what I think about time travel, it would be interesting if it is possible. However, there are some points to ponder:

That is because time on earth is a relative value rather than a constant one. That is why we have 24 time zone on earth instead of just one.

Eg. A malaysian's 12pm is a New Yorker's 12am at the same point of time, while that same point of time is constant throughout the universe ever since the beginning of well. Time.

I personally believe time travel do not exist, all the existing time paradoxes sum up my argument.

My biggest doubt is traveling back into the past. A governing body that control time travel strictly? It will only take one single rogue time traveler to go back in past, causing event with powerful butterfly effect and create all kind of chaos.

With an infinite future, are there any guarantee that nobody else but the governing body develop time machine that's capable of traveling to the past? North Korea developed nuclear weapons too you know so what's there to stop countries that aren't on agreeable term with time traveling administrations bodies developing time machine and using them?

Time slowing down through high speed while proven possible but it's more of an illusion.

An astronaut slowed down 5 years of his time out of normal earth 10 years for eg.

So if he say, started his speedy journey at 2010, while he only aged 5 years, he still returns to Earth at the year 2020 not 2015. Since time is a relative value, it does give the illusion he traveled through time into 5 years ahead.

This post has been edited by SeaGates: Jun 15 2009, 01:17 PM

Interesting, and it's weird to see there's no one else that mentions about the butterfly effect. I had that in mind because I just watched Heroes not long ago and was discussing about butterfly effect and chaos theory with my friend last night XD

On the other hand, does theory of time relativity apply here in some manner? I'm interested, but yet I might be wrong. XD

-crap double posted-

This post has been edited by eXPeri3nc3: Jun 15 2009, 02:08 PM

to me... time travelling doesnt exist and wouldnt, mainly because i believe that this little thingy called time doesn't exist. This thing call time is just a calculation of duration.

imagine you can time table, try doing something like terminator. U hate this guy here, u come back to time, kill his father, run back to future. Easy and no one catch u for that crime xD

Don't believe in movie and shows Paradox and theory of time travel apply subjectively.

Take Terminator franchise. It is good example of time travel that defies paradox subjectively, meaning one person's paradox is applied while the other don't suffer from the effect.

In T1, the remains of Terminator were later used as research by Cyberdyne to lay the foundation for Skynet and other killing machines. The Terminator is from the future, so it becomes a loop with no beginning nor end, chicken and egg paradox.

John Connor wouldn't exist without Kyle Reese, and Kyle Reese wouldn't be sent back without John Connor. Another loop.

John Connor would have know that Skynet wasn't defeated when T2 ends. If Skynet cease to exist after he throws the chip and arm stolen from Cyberdyne into the molten steel. Why didn't the T-1000 vanishes? It won't take T3 to let John knows that Judgement Day is still there.


Time is actually a unit to calculate durations that's why it's relative (24 hour time zone thing) But, what is 'duration' then? They aren't made out of matters in the visible 3 dimension. It is said this 'duration' made up another invisible dimension that we couldn't see with conventional means. This is the place where time runs at a constant rate.

Do note that science beyond the 3 dimension is still an ongoing research(String Theory, The Theory of Everything), if I'd figured out to discuss it further I would've won a Nobel Prize already

Your father killing scenario has a paradox as well.

You kill his father, he wouldn't exist, why would you hate him? He doesn't exist! So what's drives you to go back in time and kill his father?

This is why I believe time travel doesn't exist.

This post has been edited by SeaGates: Jun 15 2009, 04:50 PM

this thread should be discussing about time travel... not paradoxes. we dont really know that much about paradoxes, too many possibilities...not to mention there's the possibilities of other dimensions / alternate realities according to string theory (afaik , my rusty science knowledge)

time travel theoretically is possible, according to general or special relativity (i forgot which).

I wonder if everything in the universe is predestined. This would lead to two possibilities (that I can think of): either time-travelling is impossible or you can only be an observer. The latter means that when you travel back, you cannot change anything at all. ie. nobody would be able to see you, hear you, feel you etc.

Or maybe it is not predestined, which means time travelling would cause history to change. I cannot think of what would happen if you change the future. ie. Would the present alter itself to fit the future?

Or maybe only some points in history cannot be changed (partially predestined). Other events can be altered to give a slightly different history. eg. If you go back and kill Hitler, someone else would replace him as Fuhrer and start World War 2. Which means Hitler would be a nobody in history, but World War 2 would still happen.

I can't help recall a quote by someone,

'I notice that even people who claim everything is predestined, look before they cross the road'

Time travel would be an interesting issue if it was actually possible, (regardless of whether it is)

Just to play devil's advocate, I believe to us, from our 3-dimensional view of things, it must honestly seem impossible. If we had somehow be able to transcend and be a 4-dimensional being, time travel would actually be as simple as moving from point a to point b.

Anyone believe that if we could travel at the speed of light, we could accomplish time travelling? Imagine you travel at speed of light, ok lets not go that far, imagine we travel at the speed of an aeroplane, a speed of 245 m/s, slow if compared to the speed of light( i think...) we already burned and vanish to air, due to.... air friction? and now u want to travel at the speed of light...

I once imagined, blackhole and wormhole( i wonder if they are same ). If u are sucked into a blackhole, u probably be sucked to another dimension or possibly another time.. xD

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Added on June 15, 2009, 6:51 pmbtw, albert einstein promoted that quote where time travel is possible if u are able to travel at the speed of light.

This post has been edited by IcyDarling: Jun 15 2009, 06:51 PM

I think being 3 or 4 dimensional is our human perspective (limited by our understanding). Just like if we insist that the world is 2-dimensional, some things that we do now would be impossible.

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Added on June 15, 2009, 6:53 pmAir-friction in the outer space is zero

This post has been edited by Thinkingfox: Jun 15 2009, 06:53 PM

Makes me think about mind travel, only in the form of frequency but when things are destroyed in the past, it does not exist anymore unless time or physical entity is recorded and can recall back like a video.

Imagine the food we ate, absorbed and passed out process in reverse! If human can do that, life becomes meaning less. Even if we are unable to interfere but can prevent something from happening like the movie "Minority report", it won't do us any good unless to prevent from near extinction trying to find clues from history.

I don't see why there is a need for time travel in the first place, life is such because we don't know, if you know when and how you will die, you will try to alter it so you can choose to die in bed peacefully.

4th dimension is in dream and 5th is teleport, I guess time travel would be 6D.

would it be possible for a shuttle to be fixed to 10 nuclear-powered rocket? Despite the heat that poor astronout will be taking

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Added on June 15, 2009, 6:55 pmmind reading?

This post has been edited by IcyDarling: Jun 15 2009, 06:55 PM

Lol I never watched a single series of Terminator XD

With that aside, you do have your points lol. But still butterfly effect does make sense, each action will make the outcome different.

And yea likewise to what you said, say you travel back in time to the past to change something, wouldn't that change the current and future you? No?