Re: TIME TRAVEL IS *POSSIBLE*

I know it is, I am from the future.




John W Kennedy wrote in message <364...@ibm.net>...
>Barry O'Grady wrote:
>>
>> John W Kennedy <rri...@ibm.net> wrote:
>>
>> :Barry O'Grady wrote:
>> :> You forget that the imagined time dilation is relative. So when you
travel
>> :> away from earth at high speed you gain 10 minutes, but you lose it the
>> :> moment you stop. But theres more. When you travel away from earth at
>> :> light speed the earth is moving away from you at light speed. So you
>> :> gain 10 minutes but then so do the people on the earth. So you gain
>> :> nothing.
>> :>
>> :> There is only one time and that is now.
>> :
>> :No.
>> :
>> :You are incorrectly generalizing Special Relativity, the equations of
>> :which apply as they stand only to the special case of objects
>> :permanently moving at constant speeds in straight lines.
>>
>> Even when you are standing still you are moveing away from some objects
>> at high speed and at the same time you are moveing towards some other
>> objects at high speed. How do you account for that?
>
>As long as everyone keeps moving in straight lines at the same speed,
>each one's clock seems to be running slower from the viewpoint of the
>other.  Since they can never meet to check, it doesn't matter which one
>is "right"; they both are.  If they _can_ meet to check, then you've
>left the limited bounds of Special Relativity.
>
>> :You do _not_
>> :"lose [accumulated time dilation] when you stop," and if you turn around
>> :and come back to Earth at the same high speed at which you left, you
>> :will find that you have gained a total of 20 minutes, the difference
>> :being that you accelerated and Earth (barring the negligible effect from
>> :the Earth's orbit being an ellipse, not a straight line) didn't.
>>
>> When you accelerate relative to the earth the earth accelerates relative
>> to you. Therefore the people on earth also gain 20 minutes. How do you
>> account for that?
>
>As I said, as soon as you stop and turn around, you're not doing Special
>Relativity any more, but General Relativity, where the issue becomes
>(very loosely speaking) "Which one feels a pseudogravity effect from the
>acceleration?"  You do.  Earth doesn't.
>
>--
>-John W. Kennedy
>-rri...@ibm.net
>Compact is becoming contract
>Man only earns and pays.  -- Charles Williams
>
>

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