[PlatinumZr0]

Is time a dimension? Can something move through it? We cannot because if we could, we would have, just like in 4D. But what about TD (yes time-dimension)? Can we move through time. Like speed up our movement through time not space. So that way we could age slower or faster. Or indefinitly to technically stop time. Also, 1D 2D and 3D are spacial dimensions. If space and time are connected is there a TD?

[swansont]

Yes, that's why time is often referred to as the fourth dimension. When you learn about relativity, you find the relationship is more complex than our everyday experience: we move through spacetime at a constant speed, so motion through space slows the motion through time.

[michel123456]

PlatinumZr0, on 31 August 2010 - 01:41 AM, said:

Is time a dimension?

Yes.

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Can something move through it?

Everything moves through it. Everything massive. Massless particles don't know time.

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We cannot because if we could, we would have, just like in 4D.

And we do.

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But what about TD (yes time-dimension)?

good question. What about dimension, generally?

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Can we move through time.

yes, all the time.

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Like speed up our movement through time not space.

aha. Good question. We can slow time, by moving faster through space. But speeding up time? I don't know.

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So that way we could age slower or faster.

yes.

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Or indefinitly to technically stop time.

You just have to move at speed of light, and time stops.

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Also, 1D 2D and 3D are spacial dimensions.

That's the usual way we describe it. But what is time for me may be space for someone else.

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If space and time are connected is there a TD?

yes there is, because space and time are connected. But that does not explain anything. The question is "what is a dimension"?

This post has been edited by michel123456: 31 August 2010 - 02:02 PM

[PlatinumZr0]

michel123456, on 31 August 2010 - 02:01 PM, said:

And we do.

Sorry I should have clarified. *We cannot ACCELARATE...

[michel123456]

it's a clue.

[IM Egdall]

swansont, on 31 August 2010 - 09:54 AM, said:

Yes, that's why time is often referred to as the fourth dimension. When you learn about relativity, you find the relationship is more complex than our everyday experience: we move through spacetime at a constant speed, so motion through space slows the motion through time.

Fisrt of all, in special relaitivy, relative motion effects time and space. 1) Time slows down with relative motion. For example, a clock actually runs slower in a moving car than it does in one at rest (by a very tiny amount). And the faster the car moves through space, the more slowly time passes inside the car. 2) Space contracts with relative motion (in the direction of motion). The car's length is actually a tiny bit less when it is in motion. And the faster the car goes through space, the more it's length shrinks. (All this as seen from a stationary observer.)

But a certain formula called the spacetime interval is the same value no matter what the (uniform) motion. In other words, it is unaffected by relative motion. (The square of the spacetime interval equals the difference between the square of the time interval and the square of the space interval). This crazy formula, the spacetime interval, gives physicists something that does not change in a world of relative motion. From this, the equations of physics are written with three space and one time dimension. That's where the so-called fourth dimension of time comes from in relativity.

And, as swansont says, motion through space slows down time (like in the moving car.) In fact, when you are at rest, you are moving through time (e.g aging) as fast as you can. As soon as you move through space, your time slows down. (You are now moving through time or aging more slowly.) Its a kind of trade-off. The faster you move through space, the slower you move through time. For a photon, which moves through space at the speed of light, there is zero motion through time. So a photon never ages. To a photon, time is frozen. Wild huh!

[Thefourth]

Time is a dimension but do not consider it as the fourth. When speaking about our universe, you'd normally say three spatial dimensions plus time. There is an actual fourth dimension, do research about the tesseract or hypercube. Very intresting stuff.

[PlatinumZr0]

Thefourth, on 10 September 2010 - 05:24 AM, said:

Time is a dimension but do not consider it as the fourth. When speaking about our universe, you'd normally say three spatial dimensions plus time. There is an actual fourth dimension, do research about the tesseract or hypercube. Very intresting stuff.

Yes it is.

[alpha2cen]

Time problem is difficult.
Can we make a standard clock of the Universe?
According to the General relativity theory, its not easy to do that in the Earth.
To make the standard clock we have to eliminate speed and gravity effect from the the universal standard clock operation.
Earth gravity, Galaxy gravity, Local group gravity,... , Earth movement, Solar system movement, Galaxy movement and Local group movement effects must be removed.
And then, where is the center of the Universe that does not move.

Measuring problem.
We can mesure the standard time with the electromagnetic vibration of the atom.
Electromagnetic vibration period, molecular behavior, controls our every life -- living, death, four seasons and matter phenomena ...
Indirect one is the light speed.
Impotant one is that light speed is changed.

At any rate in the theory we consider time as 4th dimension.
Its standard for every calculation. Its easy.

This post has been edited by alpha2cen: 14 November 2010 - 01:29 AM