# The Naked Scientists Forum

### Author Topic: What is time dilation?  (Read 3447 times)

#### Naufal the B. S.

• Sr. Member
• Posts: 179
##### What is time dilation?
« on: 27/02/2010 06:36:46 »
One again, why time in space is different?

#### LeeE

• Neilep Level Member
• Posts: 3382
##### What is time dilation?
« Reply #1 on: 27/02/2010 13:25:44 »
Because time and space cannot be separated and are essentially just different aspects or views of the same thing, so you can't change your movement through one without affecting your movement through the other.

#### Naufal the B. S.

• Sr. Member
• Posts: 179
##### What is time dilation?
« Reply #2 on: 28/02/2010 00:08:28 »
Why is time in OUTER EARTH different with time in earth?

#### KennyC

• First timers
• Posts: 7
##### What is time dilation?
« Reply #3 on: 28/02/2010 12:57:15 »
Why is time in OUTER EARTH different with time in earth?

Are you talking about time being different on the surface of the Earth verses in the interior?

Or in Orbit around Earth vs on the surface?

#### Naufal the B. S.

• Sr. Member
• Posts: 179
##### What is time dilation?
« Reply #4 on: 02/03/2010 02:43:33 »

yes, orbiting earth and the surface earth. Why is the time different?

#### JP

• Neilep Level Member
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##### What is time dilation?
« Reply #5 on: 02/03/2010 06:37:08 »
In order for two people with different clocks to measure time differently, one of two things has to be happening:
(1) they have to be moving with respect to each other,
(2) they have to be located at different levels of a gravitational field.
If they aren't moving fast (compared to the speed of light) or if the gravitational fields they see are very similar in strength, their clocks will run at approximately the same rate compared to each other.  On the earth's surface, people aren't moving too fast and they're all experience approximately the same gravitational field strength, so time is measured the same by everyone.

In space, you experience less gravity, so that would cause your clock to run faster than here on earth.  Also, many objects in space are moving very quickly with respect to each other, so that can further cause time dilation.

#### flr

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##### What is time dilation?
« Reply #6 on: 02/03/2010 17:46:44 »
An immediate consequence of the constancy of the speed of light is that the time is relative: it ticks with different rates depending on uniform motion.

Then comes in the play the general relativity which show that the flow of time (how fast a light clock tick) is not independent to what is inside the universe; it appear to depend on mass, gravity, acceleration.

Time dilation can be easily figured out using that "light clock" and the fact that the speed of light is the same and equal to c regardless of the observer or the speed of the source or the direction of the light.

#### Naufal the B. S.

• Sr. Member
• Posts: 179
##### Will a plane at the speed of light burned up?
« Reply #7 on: 03/03/2010 00:57:49 »
How different gravitational field can make different time?

#### The Naked Scientists Forum

##### Will a plane at the speed of light burned up?
« Reply #7 on: 03/03/2010 00:57:49 »