time reversal

[kotss]

Actually one theory is in conjunction with the many worlds interpretation of quantum mechanics.
If your were able to travel back in time and effect a change, then the universe would split and all future
actions would proceed with the effect in cause but you would be trapped in that new universe and
travelling back to the future would be the future of that universe.

 

[ddviper]

i can see mans inquisitive nature to want to know how and what happens when you go back in time but why would you ever do this? there would be dire conciquences and anyhing that happend would affect someone or something sometime and everything would b screwed up. lets just say that u saved FDR from being murdered, who would b our president? what decsions would he have made that ended/created life? how many things would you change by un-doing one death. the thing people need to understand is that when something happens it happens, life ends, things are said, and its not meant to be changed or trifled with. things must be dealt with, sure u wish u had asked that girl to marry you before she went off to war and perished, but u didnt and u must live with that choice and u can cry and think about it all u want, but u made that choice and u shouldnt change that.

so even if i found a way to go back in time, i wouldnt. it could/would screw up anything. what about the person that was looking at u funny becuase u appeared out of nowhere and crashed into a car full of kids?

again i could go on and on with more and more examples, but do us a favor if u do find a way to travel back in time (which i doubt u will), dont do it.

 

[Rock Hydra]

Even if it were possible, theoretically, nobody probably would recognize the concequences of somebody traveling time and then actually relate it to such.

My dog got hit by a car today, unfortunatly.
How do I know that somone from the future didn't just come hit my dog to stop some "evil plot for dogs to conquer humans"?

 

[imported_jb]

back on topic instead of getting all philisophical... do ya think its possible? can you go fast enough to the point where the atoms of yesterday still exist? or is there a brick wall where time = 0 ? when sending info to the past, wouldn't it go by every event on the way? is energy causing those events or is it some kind of 'recording' ? you'd be reversing explosions, expansion of the universe, motion, etc... unless it only affected a certain sphere of influence.

 

[KevinF]

Originally posted by: RockHydra11
My dog got hit by a car today, unfortunatly.
How do I know that somone from the future didn't just come hit my dog to stop some "evil plot for dogs to conquer humans"?

My favorite time travel novel ever is Asimov's The End of Eternity, about a future society that exists outside of time and continually interferes with time in an effort to improve life for humanity. It's my favorite Asimov novel; it's a shame it's so obscure. It has a completely different perspective from the way time travel is normally employed in books and movies.

 

[Suture]

I remember reading a very interesting article in Omni magazine about 10 years ago on time travel. IIRC, it had something to do with the lack of gravity, but they could only estimate about 1 or 2 seconds or something like that into the future. I really wish I still had the article (much less the magazines I had). Anyone know what I'm referring to? I'd love to take another look at it.

 

[SagaLore]

Originally posted by: Suture
I remember reading a very interesting article in Omni magazine about 10 years ago on time travel. IIRC, it had something to do with the lack of gravity, but they could only estimate about 1 or 2 seconds or something like that into the future. I really wish I still had the article (much less the magazines I had). Anyone know what I'm referring to? I'd love to take another look at it.

Even if it were only milliseconds - put it through a loop and you could go quite far into the future.

 

[Deskstar]

How about this situation. Two twin brothers of the same age start out on the Earth . One stays on Earth but the other brother gets into a rocket and speeds into orbit around the early for 20 years. It is well proven that the person in orbit ages slower than the person on earth. Einstein predicted it; and atomic clocks prove that time slows as one approaches the speed of light...relative to clocks that are moving slower. But, what happens the astronaut brother returns to earth. When seeing his younger earthbound brother, would he not think that he had "gone back in time" in relation to his own age? Yes, he would think so. But, in fact both brothers have never left their own space-time. And rejoining, those space-times simply converge again. Neither brother really went forward or backwards in time. I have no idea is this is an accurate description; but it may be close enough for a "C" in the course.

Deskstar

 

[Suture]

Actually, Deskstar -- that's very close to what the article in Omni was saying.

 

[imported_jb]

another problem i saw with time travel.
in theory, when traveling to the future, your speed limit seems to be the speed of light (c). so when travelling to future, your speed must remain <c. when going to the past however, your speed could be any multiple of c. (2c, 4c, 10c, etc.)
whatever.. i'm sticking w/ the BrickWall @ t=0 theory.

 

[joe4324]

It just doesnt make sense!

its done, it gone, buh bye! now I think we can SLOW time, the whole black hole thing, hell we could even travel faster then the speed of light and follow solar winds that passed earth 1,000 years ago, but, going back IN time, in the romantic sense... I just dont see how. I'd love to see an explanation.

 

[wkwong]

There is at least 1 time travel thread every week in HT. lol

 

[mordantmonkey]

malak is right... time doesn't exist. it is a human construct to measure change, time does not "move". matter and energy move, we percieve this mvement and call it time. really there is only now. i remember things because they are in my brain and i am recalling them NOW.
and travel is the wrong word for time anyway. yes in order to "travel" into the future you may have to move faster than the speed of light but it just slows or stops change for YOU, and everything else goes along as normal, so you are in the future but not as old you would have been... yes much like the cryogenics thing.

 

[Genx87]

This is a completely uneducated guess.

But maybe we are looking at time travel in a too complex light?
Radio waves travel at the speed of light. Radio waves let us capture what happened minutes ago. When you think about the the idea that when you travel at the speed of light time supposedly stops, isnt this kind of proving that theory?

Now can we travel back in time? My common thought would say if you can travel faster than the speed of light then yes. But is that feasible or even possible? It doesnt sound like it if Einstein theorys where your mass becomes infinite at light speed holds true.

I guess the question to me is how do radio and light waves accelerate to the speed of light? And can we duplicate it?

As to me it would seem if we can capture images and radio waves from a distant time. The distance we can travel back is limited to the beginning of source we want to travel. Maybe we will need to pick each source and if possible to travel faster than the speed of light it will allow us to traverse the wave or cord depending on our speed?

I make disclaimers if my ideas dont jive with any laws regarding this stuff as I am just a laymen who likes to listen to people who know this stuff.

 

[mordantmonkey]

light and radiowave don't need to accelerate.. light travels at the speed of light instantly... it's a wave of energy. getting actual mass to travel at the kind of speed would require rediculous amounts of propulsion.
i think we get so tied up on the speed of light because it's the fastest thing we can percieve with the naked eye. of course the speed of light isn't infinite it can't instantly travel from place to place. suppose we could go faster than the speed of light teleport from place to place instantly, big whoop, it doesn't stop things from happening.
if you traveled from one planet to another light years apart instantly, and you looked at the other planet through a telescope you would see the light from the other planet from before you left. that doesn't really mean you traveled back in time just faster than the light information. if you had a powerful enough scope maybe you could even see your former self... but it wouldn't be you, it would just be an image of yourself in lightwaves traveling across space. so what.

i think gravity and it's effects on time and light are much more interesting

 

[Gilby]

Originally posted by: ddviper
b screwed up. lets just say that u saved FDR from being murdered, who would b our president? what decsions would he have made that ended/created life?

Screw it. I'm doing it. I think FDR being murdered really screwed things up.

There. It's changed. Hmmm. Looking at a new history book, I see that he still died before the end of WW2, this time of natural causes. But this Bush fellow...that seems to be a negative.

 

[genghislegacy]

go read more about science novels, many ideas in nowadays technology are developed from there

 

[Terumo]

Originally posted by: malak
It is a measurement of reality created by man. It isn't real. Reality only exists at a single moment, now.

It wouldn't be a man-made reality if time causes age. Age had to have a beginning and an eventual end. So time must have a starting point that can be gotten back too (and a end point that we can also fast forward too).

The secret of such travel may not be "out there", but in "in here" -- our very cells for they are biological clocks that do exist. Can be said of matter too. For matter is as old as the universe and probably also will outlive the universe.

Just how to travel back in time will be a lot harder than seeking travel into the future.

 

[91TTZ]

I always thought it was a funny argument when someone says "maybe we can't go back in time now but in the distant future we might be able to".

It's funny because we know that we can't back back in time now. If someone in 10,000 years was able to go back in time, you'd surely have someone going back to 2005, or 1900, or whatever. Therefore if you ever could, then you always have.

 

[91TTZ]

You know what always got me wondering? What if there were things that could go faster than the speed of light, but since we have no technology that's able to measure it, you couldn't tell. We only have light to use as a reference, so the fastest thing we can measure using light is light itself.

Also, at what speed does gravity propagate?

 

[Terumo]

Originally posted by: 91TTZ
You know what always got me wondering? What if there were things that could go faster than the speed of light, but since we have no technology that's able to measure it, you couldn't tell. We only have light to use as a reference, so the fastest thing we can measure using light is light itself.

Also, at what speed does gravity propagate?

Man is hampered by his limited senses. For man to even fathom more electromagnetic energy exists in the universe, he'll have to imagine it's existence, then try to figure how to detect it. If man doesn't, it doesn't exist to him.

There's a good chance other radiation sources exist, ones that'll spin our whole idea of the creation of the universe too. Something man could use as a carrier to speeds beyond light.

To say man can't travel faster than light, is equal to saying no other energy source can exist. Without a way to approve/disapprove that idea, neither assumption can be factual. Theories tell us man can't travel faster than light, but theories can go out the door in an instant if data comes in to disapprove that guesstimate.

We assume time is linear, it travels in a straight line. Dimensionally, we can only proceed in time. But if man could hop to another dimension (by use of a worm hole or other gravitational sling shots or holes in the fabric of space), there's no telling where he might go -- back in time, forward in time, into another universe all together.

Think about this: if you took a sphere in your hand, do you notice the sphere is suspended in another sphere? And that sphere is suspended in another (our universe). What's the universe suspended in?

Something outside our universe may exist, and it may not even be space. If we can punch a hole through it, perhaps we can do more than just travel in time. Maybe we can see the face of God that is holding that sphere we call our Universe?.

 

[kotss]

Originally posted by: 91TTZ
You know what always got me wondering? What if there were things that could go faster than the speed of light, but since we have no technology that's able to measure it, you couldn't tell. We only have light to use as a reference, so the fastest thing we can measure using light is light itself.

Also, at what speed does gravity propagate?

Gravity propogates at the speed of light. If the sun were suddenly to disappear, it would
take ~8 minutes for the earth to know that.

 

[rathfon]

Traveling 'back in time' would sound more logical than travelling forward anyways. Everything that has happened means everything has its points of placement. Forward in time, unless you believe in 'destiny' (I guess you could say), nothing has placement? It has not happened yet, and will eventually happen (destiny) but hasn't.

The way I am thinking about it, is such as if you had a timeline measured in the smallest bit of 'time' possible. Let's use nanoseconds for example. Nanoseconds ago, objects had placement, one possibility, one set. Nanoseconds from now, there's an infinite amount of possibilities.

Even if someone did go back in time and alter something, you wouldn't know.

Edit: We measure light by light because that's the fastest thing we know of. And have had the capability to measure. So if there is something faster, which there probably is, then we haven't found it yet because we either don't have the technology or are just not 'seeing' it.

 

[ahurtt]

Originally posted by: Cattlegod

think of it this way, say someone travels close to the speed of light for an extended time. time slows for him and everything else speeds up. he ages 1 year, his friends age 50, he then goes and talks to his friends who are now 50 years older.

Woah I'd hate to see that long distance bill!

 

[Reggae4k]

Originally posted by: 302efi

Originally posted by: ggjb
first off you would need a flux capacitor, a delorean, and would need to reach 88mph to travel back in time.

dont forget the plutonium!