time travel

If you built a time machine with all new parts, when you went back would the parts you use dissapear because they didn't exist then?

or if you went back into time to stop something (I.e. WW2) then there would be no reason for you to travel back in time because, what you stopped is the reason for time travel....

anyone get me?

 

yeah I get it. But time travel is impossible for numerous reasons.
1. Time isnt a physical thing, just a measurment of how long interactions take to happen (Einstein said "there are no instantanious interactions in nature")
2. To travel through time you would have to travel at the speed of light (another of Einsteins laws, Nothing can travel faster than the speed of light) which you would have to do.

but a nice thought....

 

In my opinion time has a lot more to it. We just haven't found out about it yet. It's just crazy. By the way, what are light years? I've never found out what that meant.

 

light years are a measure of distance. it is how far light travels in one year. and as the speed of light is 300 000 000 meters per second, that is a bloody long way in a year

 

well what if we found a way to travel faster than the speed of light....i mean if oyu think about teleportation....its not a hard concept to grasp. Teleportation is just taking molecules from point A and then rearranging them to point B...i truly think that we will one day figure out how to do that.....and the next step is just putting those molecules back into time....

why would you have to travel faster than light to go back into time

 

I certainly don't mean to be rude to anyone here, but if you don't comprehend why time travel requires moving faster than light or the bagage that brings with it, I wouldn't even attempt grappling with a time travel paradox.

Moreover, rearranging the molecules isn't the issue, how would you take them appart while perserving the intrinsic properties of the object?

 

good point.....but im just asking who says light and time are related, thats all im sayin...

 

omg i read the first sentence of that and didnt read anymore. it just screwd with my mind a bit too much.
hahaha
peace

 

when we say "light" it's not in a sense of turning on the light, or the sun, or artificial light. But all wavelengths that allow us to define the world around us with our visual perception, which is mainly how we understand the world. Regardless of whether or not that's how it is, that's how we all understand it, at least right now.

 

I suggest the original poster reads a bit of physics.
Ever heard of the Novikov-self-consistency principle? It basically says that if an event exists that would give rise to a paradox, or to any change in the past what so ever, the probability of that event is zero.

Also as I said before, you cannot travel faster than the speed of light. If you say "if we could find a way" you are just shitting on a lot of laws of physics. It is a purely hypothetical question which we cant answer because of the laws of physics forbid any sort of light speed travel.
The reason we cant travel at the speed of light is that the mass of an object approaching the speed of light is not constant this means that as the velocity increases its mass also does. So you get an object with an infinate mass that needs an infinate amount of energy to accelerate it.

There would also be an great risk of traveling through time because of Sensitive dependancy on initial conditions (commpnly known as the Butterfly Effect). This states that one small change could cause durastic changes in the future. For example, this is slightly linked with the issue of fate. So if i choose to get up and get a cup of coffee now, what difference will it make? But suppose i got very hyper off that cup of coffee and was playing frisbee with my friends near a road, and because of my exessive amounts of energy i run fast enough into the road and get hit by a car. THat could be linked back to me getting coffee instead of a glass of water.
So, if one was to go back in time, you would cause changes to the "real world". So if you jumped around for joy on your arrival in africa after discovering your time machines works and being in the year 1988. This small movement in the air could cause a hurricane to form, then go and destroy new york. This hurricane could cause the flooding of New York which would soon be abandoned.
I know this is an extreme example but there would be changes to the future if you did anything in the past.


Also, the issue of teleportation is another one that would be impossible to do. Just like floydianslip6 said, you would have to somehow degrade the objects molecules which would destroy the object and leave you with a pile of molecules. Then you propose to send the molecules somwhere else through nothing (which is effectivly what you are saying). Again this wouldnt work because of the conservation of matter. You cannot make things disappear. It is not possible (another law of physics).
Now think about this, what would the point in de-assembling an object into its molecules and then moving it somwhere else supposidly though nothing? Even if this could work then there would be no point in de-assembling all the objects molecules. Now if this object is a living organism, the chances of being able to de-asemble its molecules and put them back together is [almost definatly] zero.
For example how would you or whatever machine you are using know how to arrange these molecules?

I hope that has proved that you cant travel at the speed of light which therefore means you cant travel through time. And how teleportation is not possible. If you are still interested the the whole issue of light speed travel just go on wikipedia and browse though articles.

 

long post, sorry.

 

thanks peace, makes sense now.

 

tis alright.

 

So if you went back in time before you where born then you wouldnt exist? i think not, the parts would most deffinetly exist because you are bringing them to the past

 

A light year is 5,865,696,000,000 miles.

Which is 186,000 miles per second
Times 60 seconds in a minute
Times 60 minutes in an hour
Times 24 hours in a day
Times 365 days in a year

 

my room is a time machine.. seriously though..

easy to operate..

to time travel a year into the future you will need to:

- stock alot of food
- simply remain in the room for 365 days, no more, no less

its time travel.. just at regular speed.

 

Peace just wandering about your background in Physics, hobby or carrer? Where did you get all of that information?

Another intresting thing I'd like to point out is that like Peace was saying about Einstein's theory of relativity states that if you could move at the speed of light, you would infact never get any older while the entire world around you aged. But on a smaller scale this means that things in motion are slightly younger than things not in motion. Therefore the bottom of your tire is slightly younger than the side of your tire, despite the fact that the tire was processed at the same time.

Blam, your mind just got fucked, didn't it?

 

When train travel was first proposed, "learned" scientists announced with confidence that the human body could not possibly travel faster than 20 mph. So just because Einsten says we cannot travel faster than the speed of light doesn't mean that at some point in the future we will not find that assertion equally erroneous.

 

Time travel has long been a favoite daydream of mine. What if you were granted a one time round trip, forward or back, and allowed to remain for one hour before being returned? Where might you go? What might you hope to acomplish?

 

dpr - I'd go and see the very first Midnight Showing of the Rocky Horror Picture Show.

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Now. On to my (vastly incorrect) theories on time and time travel. Please note that the statements included forthwith are purely fictional and made up to amuse myself and also to assist in the writing of Science Fiction stories. Some is based on actual theory, but just enough to sound plausible.

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Time is both linear and circular. There are those who argue that Time is purely linear, but how can this be? The cycle of the seasons prove otherwise. If Time were purely linear, or purely circular, then traveling back and forth through Time would simply be a matter of moving in the correct direction on the Fourth Dimension (whose directions are indicated as Ana and Kata).

The reason that human beings cannot move Ana and Kata is because we are 3-dimensional creatures and have no proper knowledge of Ana and Kata. To explain this to you in a way you might understand, let's take a look at a 2-dimensional figure. We shall call him Tim. Tim, being 2-dimensional, can move in four directions: forward, backward, up, and down. The concept of 'in' and 'out', or as we know it, 'depth', is not one that he can grasp, because he himself has no depth. Likewise, humans do not have 'Ana' and 'Kata'.

However, I view Time as being a helix, a spiral that neither increases nor decreases in width as it travels. This spiral is caused by the linear and circular forces working both together and against each other. Time moves forward, but it also moves around, hence the cycle of day and night, and the seasons. Since Time is not completely circular, however, objects subject to Time age.

Perhaps if we could find a way to move along Ana and Kata, we could realize the possibility of Time travel, but if this were so, as we moved along Ana and Kata, we would either age, or decrease in age, depending which way we moved.

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And as for Interstellar Travel at the Speed of Light? According to the Theory of Relativity, if such travel were possible, one would age far less quickly than one does on Earth. Therefore, if one were to travel to a nearby star (let's pretend it takes you 50 Earth years to get there), Time aboard your ship would seem to be only a matter of months. If you returned to your planet, then, you would have aged only about a year or so, but the Earth would have completed 100 revolutions around the Sun, and everything and everyone you knew would be gone, or changed drastically.

(Yes, I actually use this stuff in my Sci-Fi stories! Creepy, isn't it?)

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Hope I didn't give you guys too much of a mind fuck with the Time Travel stuff. But if you're interested, you should definitely look into the Fourth Dimension and Ana and Kata. There are times when I feel I've almost got it, but it always slips away at the last moment.

Peace!