# The Naked Scientists Forum

### Author Topic: TIME DILATION  (Read 2329 times)

#### hamza

• Full Member
• Posts: 88
##### TIME DILATION
« on: 25/09/2007 01:11:48 »
We all know that time dilates when someoneone approaches the speed of light, but can somebody please explain the cause of this phenomena.. Why and how does it dilate?

#### WylieE

• Sr. Member
• Posts: 236
##### TIME DILATION
« Reply #1 on: 25/09/2007 16:22:35 »
I think this also happens on Mondays.

#### another_someone

• Guest
##### TIME DILATION
« Reply #2 on: 25/09/2007 16:47:16 »
We all know that time dilates when someoneone approaches the speed of light, but can somebody please explain the cause of this phenomena.. Why and how does it dilate?

I think that is very much like the closely related (and there is a close relationship between them) question as to why does gravity exist.  One can demonstrate it happens, and can calculate how much it happens in what circumstances, but one cannot say why it happens.

#### Soul Surfer

• Neilep Level Member
• Posts: 3345
• keep banging the rocks together
##### TIME DILATION
« Reply #3 on: 26/09/2007 00:10:23 »
This is explainable but it is quite difficult to do thoroughly within the bounds of a normal answer on these pages.  I suggest you look up the Lorentz Transformation and special relativity to find a thorough explanation.  Basically relativity points out that we are existing in a four dimensional space time world in which there are the three normal space dimensions  x,y and z in Cartesian coordinates plus the time dimension  ct  (the speed of light times time a measure of distance  and all distances and times need to be measured in terms of these four dimensions  This is OK as long as the speed is slow with respect to the speed of light but as you move faster you have to take more account of the speed in the distance and the affect is to find that time moves slower for the fast moving object.

This has been observed to be true for subatomic particles because short lived particles can move much further before they decay when they are travelling close to the velocity of light even though they cannot move any faster than the speed of light.
« Last Edit: 26/09/2007 00:12:30 by Soul Surfer »

#### lyner

• Guest
##### TIME DILATION
« Reply #4 on: 26/09/2007 23:45:19 »
This relativity thing was needed to explain a number of phenomena which were observed about 100 yrs ago. For instance, they presumed there was an 'aether' through which we were moving (it would not be likely / possible that we happen to be stationary  - particularly because we are spinning and orbiting).
Attempts, using light, to measure our speed through the aether always came up with a zero speed. If we were  on a boat and watched the waves around us, we would be able to detect our speed by looking at the waves and how fast they were apparently going in different directions. The explanation for the way that light behaves is that its speed is the same through space for all observers, whatever their speed. This has many consequences - for instance, time appears to run differently, mass and length also change.
You have to chuck Newton out of the window at this point - plus a lot of other intuitive ideas.
Btw, the magnetic effect of an electric current through a wire can be explained using the effect of special relativity even on electrons moving at a few millimetres per second. You don't necessarily have to be going very fast for SR or rear its head.

#### The Naked Scientists Forum

##### TIME DILATION
« Reply #4 on: 26/09/2007 23:45:19 »