Most people consider the 4th dimension to be time or change, as this is another way to measure something. For example, a book could be 21cm wide, 30cm high, 6cm deep and 6 months old. 4 measurements, 4 dimensions. Some people then derive a theory that we can resize things along the x, y and z axis, so why not along time, so theories of time travel are then linked in.

There are also theories of a 5th dimension, but this gets incredibly complicated and confusing, and there are still a lot of people that believe we couldn't get as far as a 5th dimension.

I believe the fourth dimension have to do with our dreams within religion and other issues concerning our thoughts and feelings. This dimension may not be physicall to this extend however, i believe that humanity can develop something which makes us experiance this dimension in a very different aspect.

ever heard the expression - A broken feeling is worst than a broken bone. Is this true? Sometimes The fourth dimension can express it in a physicall suffix in resulting the mathematical purposes of heimlich law.

If you have any further questions please pm me.

thanks.

peo

Time is a vector, being unidirectional like a one-way street. That's why we can't travel backwards thru it in some kind of imagined time-machine. Although it could be argued in theory, it's possible to move forward (leap) faster than at our customary natural progression. But to accomplish that, you'd have to be able to accelerate the expansion of the universe for at least a brief moment. Should that ever occur within our lifetime (which is highly doubtful) we'd very likely be unaware it was even happening (as it was occuring) regardless of whether it was for a second, minute, hour, day, month, year, etc. During the interval in which this theoretical "leap ahead" were to occur, time as we perceive it WOULDN'T seem to accelerate for us, for the same reason and in the same way we feel we're stationary or not moving (inside) a car that's traveling at definite and varying rates of acceleration. The only thing we'd be aware of would be a sudden onset of (natural) changes that occured faster than they should have, for which we have no reasonable explanation. For example, our hair might grow a foot long and turn gray seemingly overnight or even right before our eyes, if we happened to be looking in a mirror at the right moment. The expected changes (such as aging) that would've otherwise occured at time's "normal" rate would still happen, but at a much accelerated rate for some period.

Time isn't a dimension, at least in the usual sense, although it's useful to conceptualize it being mapped over some dimension, being the 4th as pondered by Einstein. Time (change) is continually ongoing and affects everything around us in profound ways. So it has to be reckoned with in some sort of model or other that's convenient to deal with.

It's merely a tool we devised based on the amazingly consistant intervals of planetary motion. A time measurement interval always having some chosen starting and ending points. It's purpose being to keep track of and have a way to monitor CHANGE, presumably of our expanding universe and all the other things changing within it.

Time, by definition, can't "run backwards" since it's vector-based. But we can certainly choose the interval's starting and ending points to be ones which have already occured sometime in the past. In that way, we have the ability to examine some event or events which have already passed. We can record some event that's occuring in the present using some form of media (paper, film, DVD, etc) and play it back any time we choose, at some later date in the future.

Notice the process doesn't work the other way around, however. An interval's starting point sometime in the future and whose ending point is even further in the future can't yield any useful information, until that interval of time has elasped. Just as in the example of recording a movie or TV show that's not going to air until tomorrow.

If the theory of the expanding universe is accurate and there comes a point where it stops expanding and begins contracting (consistant with Newton's law) time would then run in an opposite direction, relative to the direction it's now moving. But that doesn't mean what we know to be our history would run backwards like a movie played in reverse. It simply means time would progress in the exact opposite direction of the original time vector. Other than that, it'll just be a continuation of where it left off before the reversal occurred. A kind of game half-time, so to speak.

The unpleasant thing to ponder is what will happen once THAT vector comes to and end. Game over? Some argue the "big bang" will reoccur in an implosion of all matter in the universe, as it reunites. We were taught "matter can neither be created nor destroyed" (presumably by any of us) which implies the whole process must unfold again in it's infinite glory. But certainly "the creator" (or whomever you believe) did accomplish the creation of all the matter in our universe and by implication, could well be capable of it's destruction in whole or in part.