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Thread: Question Concerning the Twin Paradox

  1. #1 Question Concerning the Twin Paradox 
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    Ok, I just about managed to understand the twin paradox, with the help of these spacetime diagrams: http://www.math.ucr.edu/home/baez/ph...ox/doppler.gif

    However, I am confused again. What would happen if the spaceship travelled outwards at a significant fraction of c, but on the way back, travelled at non-relativistic speeds? Would we get the same result? When i tried to work it out, it appeared to me that we would actually get an opposite result, but this seems like nonsense to me.

    Any thoughts?


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  3. #2 Re: Question Concerning the Twin Paradox 
    Moderator Moderator Janus's Avatar
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    Quote Originally Posted by Stuart Thomson
    Ok, I just about managed to understand the twin paradox, with the help of these spacetime diagrams: http://www.math.ucr.edu/home/baez/ph...ox/doppler.gif

    However, I am confused again. What would happen if the spaceship travelled outwards at a significant fraction of c, but on the way back, travelled at non-relativistic speeds? Would we get the same result? When i tried to work it out, it appeared to me that we would actually get an opposite result, but this seems like nonsense to me.

    Any thoughts?
    Terence would still be end up younger than Stella, just not by as much.


    "Men are apt to mistake the strength of their feelings for the strength of their argument.
    The heated mind resents the chill touch & relentless scrutiny of logic"-W.E. Gladstone


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  4. #3 Re: Question Concerning the Twin Paradox 
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    Quote Originally Posted by Janus
    Quote Originally Posted by Stuart Thomson
    Ok, I just about managed to understand the twin paradox, with the help of these spacetime diagrams: http://www.math.ucr.edu/home/baez/ph...ox/doppler.gif

    However, I am confused again. What would happen if the spaceship travelled outwards at a significant fraction of c, but on the way back, travelled at non-relativistic speeds? Would we get the same result? When i tried to work it out, it appeared to me that we would actually get an opposite result, but this seems like nonsense to me.

    Any thoughts?
    Terence would still be end up younger than Stella, just not by as much.
    But Terence ends up older than stella...

    Here's where I got the image http://www.math.ucr.edu/home/baez/ph...n_paradox.html. It's in the section titled 'too any analyses'.
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