In time travel, wouldn't it have to be true that every moment exists at exactly the same time and space?
352384
Yes, if there were no such thing as time.\nJust for fun, try to imagine that there is no such thing as time. I think human thought/existence is very difficult without the concept of time. If time doesn't exist, then everything that has happened, is happening and will happen is right now!!! Is that possible?
25660
no. time is continuous, the intervals we use to measure it are just for our own measurement so we can compare it to itself and see how much of it has gone by.  There can be infinite intervals of time.  For example a second, a millisecond (.001s) a nanosecond(.000000001s) and you can always move the decimal one place more, making an infinate number of intervals for time, and therefore an infinate number of 'frequencies.' also, frequency is a characteristic of a wave, and time is definately not a wave.  And if there was a way for time travel, it would involve insanely fast velocities due to velocity distorting time as I have described in an answer to your previous question...
649175
are you trying to suggest that time travel in the reverse direction,ie, travelling to the past, is possible..\n\nif thats the case then anything can have an opposite of it, like mass etc. which are conventionally taken to be positive
519456
There are some strange solutions to Einsteins field equations which some theorists claim to offer the possibilty to travel backwards in time but these are pure hypothesis.\n\nFor one of these possibilties you would need a huge amount of "strange matter" which we yet even don't know what it is exactly, other of these hyothesis would allow to travel back in time, but not past the invetion of the thime machine, since this time machine is the "exit" on the other side of the "time tunnel".\n\nOther scientists say it will never be possible, for varios reasons, one of the most mentioned is the problem with causality (althogh there are again theories that that would't be a problem) another very funny one is by Stephen Hawking: There never will be time machines, becaus if it would we would see tourists from the future all the time.\n\nSo, seriuosly, don't expect to see a working time machine during your lifetime.
433550
Well, time really doesn't exist. It's a human invention. We define time as what it is because our minds can't fully comprehend the fact that the universe is one big giant now. So nothing begins, or goes away, because everything happens at the same time. We choose to say it happens at different times, but it really happens in different places, on different planes of existence.
186420
Time travel seems to make sense to us because we have the concepts of past and future.  In particular, we can vividly picture in our minds the parts of the past we have experienced.  The past can seem to have a kind of reality because of memory, as the can future because of imagination.  But, neither the past nor the future have any real existence.  There is only the present.\n\nTime is not a container like space is.  We can travel in space because other places really exist.  Time is not a container.  There's nowhere to go.  So, no, time travel is not possible.
1185627
Time "IN A SENSE" does not exist and is an illusion. \nFor example: Suppose there are two syncronized clocks on two  infinately seperated walls (one behind you and one in front of you) and the clocks are illuminated at exactly 2pm by light from your flashlight that shoots to the front and the back at the same time. And lets pretend that you are in a spaceship ---with that flashlight --accelerating (speeding up trying to reach light speed) away from one clock towards the other.just as you receive the reflection of light (showing 2 pm) within your eye from the clock behind you. And lets pretend that you reach light speed the instant the light from the clock reaches your eye. At the instant you reach light speed then any light from your flash light reflected from the clock cannot reach you because both you and the light are moving in the same direction away from the clock at the same speed. At that instant, time relative to that clock would no longer exist for you in your frame of referance. Because the only image of time that you have processed in your mind is the image of the clock at 2pm. \nIf you instantly slow down below light speed by a fraction of the speed of light, then, the light from your flashlight that is in transit behind you will begin to catch you again. Depending on the speed that you are moving time will again appear to move on the clock. But each instant of time will be defined by the speed you are moving relative to the speed of the light reflected from the clock. Your flashlight is also important in that light leaving the flashlight must first travel back to the clock and then be reflected back to the spaceship where you will see it. Therefore you will see not only time changes due to the speed you are moving, you will also see funny changes in time from the fact that your flashligh is moving with you.\nAt the same instant you are moving away from one clock you will be moving towards the other clock. The time you experience relative to this other clock will be compressed in relation to the fraction of the speed of light you are moving.\nFor these reasons, time can be said to be an illusion. However, one must keep in mind that by theory, no human or any solid matter can move at the speed of light. \nAnd it must be admitted that though time is an illusion, it is an actual unchanging property of reality.
968934
Time isn't a dimension all by itself - it's part of a dimension called space-time.\n\nAnd, I suppose, therefore if space is expanding, then space-time must also be too.
938858
YES! Time travel is possible. For example, an object traveling at high speeds ages more slowly than a stationary object. This means that if you were to travel into outer space and return, moving close to light speed, you could travel thousands of years into the Earth's future.\n\nNewton's most important contribution to science was his mathematical definition of how motion changes with time. He showed that the force causing apples to fall is the same force that drives planetary motions and produces tides. However, Newton was puzzled by the fact that gravity seemed to operate instantaneously at a distance. He admitted he could only describe it without understanding how it worked. Not until Einstein's general theory of relativity was gravity changed from a "force" to the movement of matter along the shortest space in a curved spacetime. The Sun bends spacetime, and spacetime tells planets how to move. For Newton, both space and time were absolute. Space was a fixed, infinite, unmoving metric against which absolute motions could be measured. Newton also believed the universe was pervaded by a single absolute time that could be symbolized by an imaginary clock off somewhere in space. Einstein changed all this with his relativity theories, and once wrote, "Newton, forgive me."\n\nEinstein's first major contribution to the study of time occurred when he revolutionized physics with his "special theory of relativity" by showing how time changes with motion. Today, scientists do not see problems of time or motion as "absolute" with a single correct answer. Because time is relative to the speed one is traveling at, there can never be a clock at the center of the universe to which everyone can set their watches. Your entire life is the blink of an eye to an alien traveling close to the speed of light. Today, Newtonian mechanics have become a special case within Einstein's theory of relativity. Einstein's relativity will eventually become a subset of a new science more comprehensive in its description of the fabric of our universe. (The word "relativity" derives from the fact that the appearance of the world depends on our state of motion; it is "relative.")\n\nWe are a moment in astronomic time, a transient guest of the Earth. Our wet, wrinkled brains do not allow us to comprehend many mysteries of time and space. Our brains evolved to make us run from saber-toothed cats on the American savanna, to hunt deer, and to efficiently scavenge from the kills of large carnivores. Despite our mental limitations, we have come remarkably far. We have managed to pull back the cosmic curtains a crack to let in the light. Questions raised by physicists, from Newton to Kurt Gödel to Einstein to Stephen Hawking, are among the most profound we can ask.\n\nIs time real? Does it flow in one direction only? Does it have a beginning or an end? What is eternity? None of these questions can be answered to scientists' satisfaction. Yet the mere asking of these questions stretches our minds, and the continual search for answers provides useful insights along the way.
258081
Time travel is pretty much a sure thing, at least to the past.  Tiny little wormholes pop up everywhere all the time.  If one were able to be captured, and then expanded to fit a person through (say with antigravity from the casimir effect or a lazer) a time machine could be made.  Now there are a couple of hoops to jump through of course.  Wormholes have TREMENDOUS pressure, they pretty much crush matter to a single point (called a singularity), so you would have to find a way to survive the trip.  Now, the wormhole has a beggining and an end, two sides like a tunnel.  Now, very large and very dense objects tend to slow down time, so does traveling very fast.  Drag one side of the wormhole next to something VERY dense, like say, a pulsar.  Leave it close to the pulsar and then it will experience time differently than the other side of the wormhole.  Leave it there until there is a time differential between the two that you are satisfied with (like say a year or whatever), and then drag it back right next to the other end of the tunnel.  Now you have two holes in space/time in reletively the same place, but if you walk through one side, you will come out right next to it, but in a different time, dictated by that time differential that you created.\n\nThere are of course paradoxed assciated with this.  One is the famous killing your mother paradox.  If you go back in time and kill your mother, you will not exist.  BUT, if you do not exist you could not have killed your mother and therefore you DO exist and you kill her etc etc etc.  How about a scientist which goes to the future a couple of years, opens up a scientific journal, takes quick notes of a new theory, and goes back to his time and gives the info to one of his students.  This studen then works a few years perfecting the theory and has it published.  This just so happens to be the journal that the scientist had read.  Where did the information come from in the first place, did it just appear out of nowhere?  There are lots of logical problems with this, but by the time we manage to develop the technology necessary to do all this we'll probably have figured it all out.
922481
Yes, it is very possible. If I had told people about my time travel experience, they would call me a retard. In year 2003 or 2004, I don't remember which year it was, I had kind of like the time travel experience reliving the same day. The same exact things happened to me in two straight days. It was the most weired experience I have ever had in my life. Yeah, reliving the same day.
596206
No. Time is connected to space in our own definition. Time is based on earth's revolution around the sun, and rotation on its axis. so it is relevant only to our own perspective.
70282
No.  You'd need to have a wormhole.  Current theory predicts that transversable wormholes exist but would not allow time travel.  See reference for details.
400541
I believe in the multiverse in the sense that we are perceiving one universe, but there are many possible realities that could have brought me to my current perceptions and there are many possible realities that originate from my current perceptions.  If there is no such thing as time, then all possible perceptions exist together, and what we perceive as time passing is merely our awareness of particular moments in one of the threads of events that are already existing in the "multiverse".
889031
I think it is.   I mean it's because.   Hmmm???   Just give me a minute to think.    \n\nSo if space and time are    Just another second and I'll get this.\n\nOkay...so Heaven represents being with god, so then in order to find God we would not be looking for a location, but some sort of experience that is beyond space and time???\n\nI don't know...I give up.\nGood question!
1123509
Time only makes sense within the context of the universe. The universe provides us with our very meanings of space and time. When you measure time you are really measuring change between two states of the universe. \n\nTherefore it is a tautology to say the Universe always existed. Time is part of the universe so the statement the universe existed for ALL time is of course true. We define time as what we measure by clocks WITHIN the universe.\n\nThis does not imply that the universe has existed for an infinite amount of time. We don't know whether it has or not. But by definition it HAS existed for ALL time.\n\nThe idea that time is something apart from the universe went out with Einstein. Christians need to make better arguments.
1156662
No we cannot. The time travel stories are our over enthusiastic mind's work. It just cannot be possible. Unless we attain speed of light. Do u believe in relativity? think about it... maybe u will find answers there.