How do you measure time in space?

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Profile David Chappell
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Message 1510127 - Posted: 30 Apr 2014, 2:41:06 UTC

"Clocks will still work perfectly well in space. They may appear to run faster or slower depending on the observer's point of view. But to members of the spacecraft’s crew the clocks will appear to run at a normal rate”
True, but they will be referencing Earth time. Let me throw A Winkle In Time, I know, bad pun. Lets add space to the mix. Lets say you got point A and point B. Point A is 50ft (15.24m) away from point b. It will take a set time to reach point B from point A, but as you move point b closer to point A it will take less time. When you finally have both points next to each other, puff, no more time. So the more space you have the more time you have and vice versa.
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Message 1510235 - Posted: 30 Apr 2014, 9:14:20 UTC - in response to Message 1510189.  

But what about the situation where you have two moving points at different speeds? Zenos Toroise paradox?


1 = 1/2 +1/4 +1/8 +1/16 +1/32 + ...

Adding up an infinite number of positive distances should give an infinite distance for the sum. But it doesn’t—in this case it gives a finite sum, all these distances add up to 1! A little reflection will reveal that this isn’t so strange after all: if I can divide up a finite distance into an infinite number of small distances, then adding all those distances together should just give me back the finite distance I started with.
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Message 1510265 - Posted: 30 Apr 2014, 14:04:00 UTC - in response to Message 1510257.  
Last modified: 30 Apr 2014, 14:19:37 UTC

But but but, how long does it take to cover all the increasingly small distances, does time almost come to a standstill?


The resolution of the paradox awaits calculus and the proof that infinite geometric series can converge, so that the infinite number of "half-steps" needed is balanced by the increasingly short amount of time needed to traverse the distances.

I know there are necessary and sufficient criteria that are established for the existence of exponential dichotomies for linear dynamic equations on time scales though...buuut I'm no mathematician:(
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Message 1515728 - Posted: 13 May 2014, 23:28:48 UTC - in response to Message 1510265.  
Last modified: 13 May 2014, 23:35:42 UTC

But but but, how long does it take to cover all the increasingly small distances, does time almost come to a standstill?


The resolution of the paradox awaits calculus and the proof that infinite geometric series can converge, so that the infinite number of "half-steps" needed is balanced by the increasingly short amount of time needed to traverse the distances.

I know there are necessary and sufficient criteria that are established for the existence of exponential dichotomies for linear dynamic equations on time scales though...buuut I'm no mathematician:(


I'm sure glad your well read about it, me I got lost after reading Einsteins book of relativity in about 1/2 way through. :))
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Message 1515730 - Posted: 13 May 2014, 23:44:46 UTC - in response to Message 1515728.  

But but but, how long does it take to cover all the increasingly small distances, does time almost come to a standstill?


The resolution of the paradox awaits calculus and the proof that infinite geometric series can converge, so that the infinite number of "half-steps" needed is balanced by the increasingly short amount of time needed to traverse the distances.

I know there are necessary and sufficient criteria that are established for the existence of exponential dichotomies for linear dynamic equations on time scales though...buuut I'm no mathematician:(


I'm sure glad your well read about it, me I got lost after reading Einsteins book of relativity in about 1/2 way through. :))


:) Well, my other half is always losing himself in a book... :) but it's always the same book. He's still reading a Brief History of Time after starting it around about the dawn of time I think :) he is enjoying it :) but keeps having to go back to the beginning again.
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Message 1515737 - Posted: 13 May 2014, 23:56:33 UTC - in response to Message 1515730.  

But but but, how long does it take to cover all the increasingly small distances, does time almost come to a standstill?


The resolution of the paradox awaits calculus and the proof that infinite geometric series can converge, so that the infinite number of "half-steps" needed is balanced by the increasingly short amount of time needed to traverse the distances.

I know there are necessary and sufficient criteria that are established for the existence of exponential dichotomies for linear dynamic equations on time scales though...buuut I'm no mathematician:(


I'm sure glad your well read about it, me I got lost after reading Einsteins book of relativity in about 1/2 way through. :))


:) Well, my other half is always losing himself in a book... :) but it's always the same book. He's still reading a Brief History of Time after starting it around about the dawn of time I think :) he is enjoying it :) but keeps having to go back to the beginning again.


my Dad had one too zane gray SP? The Purple Sage, he loved it and i can't tell you how many times he read it.
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Message 1515741 - Posted: 14 May 2014, 0:06:25 UTC

one thing explained to me in physics was if you go the speed of light and shine your light foreword the light still will go at the speed of light. so is to say that if your going faster, shouldn't light bend?
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Message 1515750 - Posted: 14 May 2014, 0:40:28 UTC - in response to Message 1515741.  

one thing explained to me in physics was if you go the speed of light and shine your light foreword the light still will go at the speed of light. so is to say that if your going faster, shouldn't light bend?


I THINK that's what happened... but I can't be sure Grant... I sort of hit the wall so fast I'm a bit dazed... and I'm going to need a new torch before I can try it again :)
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Message 1515755 - Posted: 14 May 2014, 0:59:55 UTC - in response to Message 1515750.  
Last modified: 14 May 2014, 1:14:00 UTC

one thing explained to me in physics was if you go the speed of light and shine your light foreword the light still will go at the speed of light. so is to say that if your going faster, shouldn't light bend?


I THINK that's what happened... but I can't be sure Grant... I sort of hit the wall so fast I'm a bit dazed... and I'm going to need a new torch before I can try it again :)


I just know I got a "C" because I challenged him. He was a bugger in the first year in college. I just couldn't buy it. dead ahead sure nothing, side to side well maybe but would be striped as light goes somewhat straight.
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Message 1515777 - Posted: 14 May 2014, 1:56:58 UTC - in response to Message 1515741.  

one thing explained to me in physics was if you go the speed of light and shine your light foreword the light still will go at the speed of light. so is to say that if your going faster, shouldn't light bend?

Not if whatever you use to go faster than light is used on your flashlight too. Let me work out the math this may take long division though.
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Message 1515887 - Posted: 14 May 2014, 8:42:57 UTC - in response to Message 1515741.  
Last modified: 14 May 2014, 8:45:10 UTC

one thing explained to me in physics was if you go the speed of light and shine your light foreword the light still will go at the speed of light. so is to say that if your going faster, shouldn't light bend?


That wouls result in a paradox as it's physically impossible for any matter to travel faster than the speed of light. cfr. The Twin paradox of relativity

Hypothetical questions sadly do not have definitive answers:(

Sometimes people persist: What would the world look like in the reference frame of a photon? What does a photon experience? Does space contract to two dimensions at the speed of light? Does time stop for a photon?. It is really not possible to make sense of such questions and any attempt to do so is bound to lead to paradoxes. There are no inertial reference frames in which the photon is at rest so it is hopeless to try to imagine what it would be like in one. Photons do not have experiences. There is no sense in saying that time stops when you go at the speed of light. This is not a failing of the theory of relativity. There are no inconsistencies revealed by these questions. They just don't make sense.
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Message 1515895 - Posted: 14 May 2014, 9:06:54 UTC - in response to Message 1515887.  
Last modified: 14 May 2014, 9:17:27 UTC

one thing explained to me in physics was if you go the speed of light and shine your light foreword the light still will go at the speed of light. so is to say that if your going faster, shouldn't light bend?


That wouls result in a paradox as it's physically impossible for any matter to travel faster than the speed of light. cfr. The Twin paradox of relativity

Hypothetical questions sadly do not have definitive answers:(

Sometimes people persist: What would the world look like in the reference frame of a photon? What does a photon experience? Does space contract to two dimensions at the speed of light? Does time stop for a photon?. It is really not possible to make sense of such questions and any attempt to do so is bound to lead to paradoxes. There are no inertial reference frames in which the photon is at rest so it is hopeless to try to imagine what it would be like in one. Photons do not have experiences. There is no sense in saying that time stops when you go at the speed of light. This is not a failing of the theory of relativity. There are no inconsistencies revealed by these questions. They just don't make sense.


that's why I asked my physic's teacher on that very thing, he said nope that's just the way it is. I got the "C" and he went home happy. I feel their is a hell of a lot more to it, speed limit? I don't think so. Maybe for light but not everthing. black holes is another thing also. again I have no PHD but it's all my thoughts.
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Message 1515900 - Posted: 14 May 2014, 9:16:09 UTC - in response to Message 1515895.  

one thing explained to me in physics was if you go the speed of light and shine your light foreword the light still will go at the speed of light. so is to say that if your going faster, shouldn't light bend?


That wouls result in a paradox as it's physically impossible for any matter to travel faster than the speed of light. cfr. The Twin paradox of relativity

Hypothetical questions sadly do not have definitive answers:(

Sometimes people persist: What would the world look like in the reference frame of a photon? What does a photon experience? Does space contract to two dimensions at the speed of light? Does time stop for a photon?. It is really not possible to make sense of such questions and any attempt to do so is bound to lead to paradoxes. There are no inertial reference frames in which the photon is at rest so it is hopeless to try to imagine what it would be like in one. Photons do not have experiences. There is no sense in saying that time stops when you go at the speed of light. This is not a failing of the theory of relativity. There are no inconsistencies revealed by these questions. They just don't make sense.


that's why I asked my physic's teacher on that very thing, he said nope that's just the way it is. I got the "C" and he went home happy. I feel their is a hell of a lot more to it, speed limit? I don't think so. Maybe for light but not everthing.



We have to obey the Laws of Fyzix Grant, that's a well known fact. The 'laws' of Humanities are another matter...
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Message 1515902 - Posted: 14 May 2014, 9:20:10 UTC - in response to Message 1515900.  
Last modified: 14 May 2014, 9:23:03 UTC

one thing explained to me in physics was if you go the speed of light and shine your light foreword the light still will go at the speed of light. so is to say that if your going faster, shouldn't light bend?


That wouls result in a paradox as it's physically impossible for any matter to travel faster than the speed of light. cfr. The Twin paradox of relativity

Hypothetical questions sadly do not have definitive answers:(

Sometimes people persist: What would the world look like in the reference frame of a photon? What does a photon experience? Does space contract to two dimensions at the speed of light? Does time stop for a photon?. It is really not possible to make sense of such questions and any attempt to do so is bound to lead to paradoxes. There are no inertial reference frames in which the photon is at rest so it is hopeless to try to imagine what it would be like in one. Photons do not have experiences. There is no sense in saying that time stops when you go at the speed of light. This is not a failing of the theory of relativity. There are no inconsistencies revealed by these questions. They just don't make sense.


that's why I asked my physic's teacher on that very thing, he said nope that's just the way it is. I got the "C" and he went home happy. I feel their is a hell of a lot more to it, speed limit? I don't think so. Maybe for light but not everthing.



We have to obey the Laws of Fyzix Grant, that's a well known fact. The 'laws' of Humanities are another matter...


well I questioed him and he couln't come out with a straight answer. :)) "C" none the less.

Julie I'm not the smartest person in the world but it was worth asking.
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Message 1515903 - Posted: 14 May 2014, 9:32:30 UTC

as they say if the world was on a calendar of a year, we have only been here the last 5 minutes of the Dec 31st.
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Message 1515906 - Posted: 14 May 2014, 9:36:52 UTC

Amazing, isn't it:) We're still in our infancy...
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Message 1515907 - Posted: 14 May 2014, 9:39:04 UTC - in response to Message 1515906.  

Amazing, isn't it:) We're still in our infancy...


very true Julie
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Message 1515919 - Posted: 14 May 2014, 11:03:03 UTC - in response to Message 1515918.  

We have to obey the Laws of Fyzix Grant, that's a well known fact.

I object to that statement as a matter of principle!

We are "constrained" on this earth by certain parameters, that at present with our level of scientific knowledge, we cannot change or alter. That does not mean that in the future, or elsewhere in the universe, things could or are different.

We do not have to "obey" the laws of physics, we grudgingly accept them as they unfortunately are, but we should be finding ways around these constraints that are holding the human race back from fulfilling it's full destiny.



And then Humanities come into the picture...
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Message 1515923 - Posted: 14 May 2014, 11:31:02 UTC

So presumably you are saying that, when we can, we should venture into the cosmos as peaceful ambassadors rather than warlike Klingons?


Of course!

I think I can accept that as a basis for future human evolvement. But we have enough strife back here at home, gawd knows what it may be like out there in the "REAL WORLD"


True. Maybe it's for the best we don't know everything...
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Message 1515990 - Posted: 14 May 2014, 14:47:06 UTC - in response to Message 1515918.  

We do not have to "obey" the laws of physics, we grudgingly accept them as they unfortunately are, but we should be finding ways around these constraints that are holding the human race back from fulfilling it's full destiny.
It would not be finding a way around the laws of physics but using laws we don't yet understand. If there are not exact unchanging laws that means all being is at the whim of a capricious and arbitrary force.
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