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Moving at the speed of light #356496
02/02/11 13:26
02/02/11 13:26
Joined: Mar 2003
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analysis paralysis
NITRO777 Offline OP
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Is it true that if you move at the speed of light from earth in one direction for 12 hours and then come back to earth at the speed of light that you will have only aged 24 hours yet the earth is 1000 years older? Does anyone know how light speed travel would work? tongue

Its a serious question, I'm trying to imagine how theoretical light speed travel would work so I can check the reality of scifi books etc.

Re: Moving at the speed of light [Re: NITRO777] #356497
02/02/11 13:39
02/02/11 13:39
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Yep its true. In real I'm a medieval king but thanks to my spaceship I'm currently a indie game developer.


Shitlord by trade and passion. Graphics programmer at Laminar Research.
I write blog posts at feresignum.com
Re: Moving at the speed of light [Re: WretchedSid] #356498
02/02/11 13:43
02/02/11 13:43
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Posts: 3,010
analysis paralysis
NITRO777 Offline OP
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Thats hilarious. But doesn't traveling at light speed theoretically have some effect on time? Anyone have a clue or am I just asking the wrong forum

Re: Moving at the speed of light [Re: NITRO777] #356500
02/02/11 13:58
02/02/11 13:58
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Joozey Offline
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Some effect on time? Time is relative for everyone. Time is not one thing, there is not one timeline or so. So yes it affects time in that a moving entity progresses slower in time than one who stands still in respect to the moving entity.

But we all move with the rotation of the earth, rotation around the sun, our sun through the galaxy, and the galaxy through the universe with unimaginable speeds. The funny and mindboiling thing is that everything is relative. Whichever way you move (faster than our current speed, or "slower" when you move the other way) you always end up moving slower through time compared to your starting point.

Last edited by Joozey; 02/02/11 13:59.

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Re: Moving at the speed of light [Re: Joozey] #356506
02/02/11 15:02
02/02/11 15:02
Joined: Jan 2003
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Joey Offline
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http://en.wikipedia.org/wiki/Time_dilation

One thing which always bothers me is the example you use and everyone else states. If you say that you move at a considerable fraction relative to earth, thus your clock moves slower, I (the one on earth) say that I am moving at a considerable fraction relative to you, thus my clock moves slower.

Anyone knows the solution? wink

Re: Moving at the speed of light [Re: Joey] #356527
02/02/11 16:59
02/02/11 16:59
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If I recall correctly the equation is:

t1 = t0/(1-(v^2/c^))^.5 (simplified for frame)

Traveling at c produces multiple singularities in the equations. Traveling at v << 0 (the only possible situation for an individual) then t1 = t0, i.e. no difference.

Special Relativity


Researcher & clinician. A6, A7, & A8
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Re: Moving at the speed of light [Re: carlpa] #356552
02/02/11 18:25
02/02/11 18:25
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Joey Offline
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Originally Posted By: carlpa
Traveling at c produces multiple singularities in the equations. Traveling at v << 0 (the only possible situation for an individual) then t1 = t0, i.e. no difference.

?

Re: Moving at the speed of light [Re: carlpa] #356554
02/02/11 18:37
02/02/11 18:37
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Joozey Offline
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Quote:
If you say that you move at a considerable fraction relative to earth, thus your clock moves slower, I (the one on earth) say that I am moving at a considerable fraction relative to you, thus my clock moves slower.

Anyone knows the solution? wink

I guess I forgot one part, couldn't remember what it was at first, but the time dilation effect is applied to the observer undergoing an acceleration. If the traveller moves away, and then back, the traveller becomes older younger as it underwent all accellerations.

Last edited by Joozey; 02/02/11 22:04.

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Re: Moving at the speed of light [Re: Joozey] #356560
02/02/11 19:07
02/02/11 19:07
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Joey Offline
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That's correct (although the one traveling is the younger one in the end). The thing is that the one traveling away and then back changes his inertial system (e.g. by accelerating) which in the end cuts down his time consumption. The acceleration itself doesn't have an effect, though, as you're accelerating and decelerating. If you could change your inertial system without acceleration this would have the same effect.

This would allow us to build a time machine. *want*

Re: Moving at the speed of light [Re: NITRO777] #356583
02/02/11 20:09
02/02/11 20:09
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AlbertoT Offline
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Originally Posted By: NITRO777
Is it true that if you move at the speed of light from earth in one direction for 12 hours and then come back to earth at the speed of light that you will have only aged 24 hours yet the earth is 1000 years older? Does anyone know how light speed travel would work? tongue

Its a serious question, I'm trying to imagine how theoretical light speed travel would work so I can check the reality of scifi books etc.


Yes it is true..it is a serious answer
All the clocks on board of the shuttles are few seconds slower than the ones on the earth
What people often misunderstand is the following :
From the point of view of the pilot just 24 hours have elapsed
In other words you can travel in the future of the earth but you can not expect to live longer


Last edited by AlbertoT; 02/02/11 20:13.
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