Can anyone explain this theory about time dilation?

Question

If this is so, what impact could it have on measuring the age of the universe?

Time dilation — the time lapse between two events is not invariant from one observer to another, but is dependent on the relative speeds of the observers' reference frames (e.g., the twin paradox which concerns a twin who flies off in a spaceship travelling near the speed of light and returns to discover that his twin has aged much more).

Answer 1

The explanations and examples of time dilation are pretty much correct. However, time dilation DOES exist between intertial frames in the expanding universe. For instance, supernova light curves at high redshift decay much more slowly than they do in the local universe. This observation weighs strongly against "tired light" explanations of the cosmological redshift (some argue that light loses energy over long distances for reasons unrelated to expansion).

The question actually asked what is the **impact** of time dilation on the determination of the age of the universe. As a result, a variable term called "proper time" is used in cosmological metric equations that are used to calculate the size and age of the universe based on large redshift observations. This term can be used to express delta-time as function of redshift in the Hubble equations (v=HD; delta time is implicit in velocity, right?). This variable expression of delta-time thus ends up figuring into estimates of the age of the universe, and its size (assuming accurate measure of the Hubble constant as a function of redshift itself!)

Answer 2

There is no impact the clock that a measure the time of the universe is it's made in his own system.
Time dilatation is like this. Nothing can travel with the speed of light. So if you are in the middle of a moving train. You send a signal (light) to the both ends. You will expect to reach the target at the same time. But a ground observer will expect that the light that travels in the direction of the train will arrive after the light that travels opposite to the direction of the train. So tow events are not simultaneous in different observation systems. From this mental experiment the theory of relativity can begin. There are no forces in the special relativity, so be careful.

Answer 3

Time dialation is a "local" effect in Special Relativity, between two moving observers---each observer sees the other's clock ticking slower than his own. By "local", I mean that the two observers are fairly close to each other, so that there is no significant curvature of space between them. For the effect to be significant, the two observers must be near each other, but have a relative velocity near the speed of light.

The age of the Universe is the time since the Big Bang. It is not really affected by the time dialation effect, because most of the matter in the Universe is not moving at high speeds, that is, near the speed of light. We can see that galaxies that are "only" 300 million lightyears away are moving away from us at "only" 7,500 kilometers per second. This means that 13.7 billion years ago, they were right on top of us, and so that is the age of the Universe. But 7,500 kilometers per second is much less than the speed of light, 300,000 kilometers per second. So time dilation doesn't enter into it.

Answer 4

Hi. Imagine three people watching fireworks form the same place. One is blind, one is deaf, and the third has sight and hearing. They all have a button to push when the firework explodes. Think this through. When the firework explodes, the light travels at about 1 billionth of a second per foot of distance. The sound travels much slower. The explosion is 1,000 feet away. None of the people press their button at the exact moment the explosion takes place because light takes about 1 millionth of a second to reach the people (lets say). The two with sight will press the button first. The blind person will press it when the sound reaches her. Who is correct? None of them. You would have to be right at the explosion to be close to the correct time.

Then follow answerer number 2's advice.

Answer 5

You're going to need to start from the beginning with that question... look up topics like that on wikipedia. just follow the links around until you understand the whole set of ideas... time dilation, g. relativity, s. relativity, big bang, hubble flow, red shift, etc.

Answer 6

i dont know but i do know that evryone excepting the minuets hours days weeks and months as theirs has a big 90% effect on the way they behave so its hard to find a real person that doesnt only want to know about stuff like that