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  1. #21

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    Quote Originally Posted by gingerjedi View Post

    Someone at sea level would conclude that time has passed more slowly for the man on the mountain.
    Someone with very sharp eyesight.
    “We've always defined ourselves by the ability to overcome the impossible. And we count these moments. These moments when we dare to aim higher, to break barriers, to reach for the stars, to make the unknown known. We count these moments as our proudest achievements. But we lost all that. Or perhaps we've just forgotten that we are still pioneers. And we've barely begun. And that our greatest accomplishments cannot be behind us, because our destiny lies above us.”

  2. #22

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    Quote Originally Posted by SpontaneousOrder View Post
    No. They aren't moving relative to each other, so there is no relative velocity time dilation - only gravitational time dilation. Gravitational time dilation doesn't mirror both ways because it falls outside of special relativity (and into general relativity).

    In this case the man on the mountain would age more.


    I believe Scoots comment, though, is related to you using the word 'travel' - time is a dimension and so it doesn't travel. Infact the word travel by definition implies a change in position in relation to a change in time; so that's a limitation in the english language - it's very hard to talk abut time in a non-recursive way.
    I bow down to your superior knowledge, I must admit my understanding of the subject comes from the layman's version of 'A Brief History of Time' (The Universe in a Nutshell) and 'Planet of the Apes'.

    I must have skipped the bit about gravitational time dilation.
    Science isn't about why, it's about why not. You ask: why is so much of our science dangerous? I say: why not marry safe science if you love it so much. In fact, why not invent a special safety door that won't hit you in the butt on the way out, because you are fired. - Cave Johnson

  3. #23

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    Quote Originally Posted by gingerjedi View Post
    I bow down to your superior knowledge, I must admit my understanding of the subject comes from the layman's version of 'A Brief History of Time' (The Universe in a Nutshell) and 'Planet of the Apes'.

    I must have skipped the bit about gravitational time dilation.
    Well even ignoring gravity, the clue was in your own posting. You kept saying 'relative to each other', but a man at the foot of a mountain and a man at the top are not moving at all, relative to each other.

    They're only moving relative to each other if you choose some arbitrary 3rd party frame of reference. So ignoring gravity there would be no time dilation at all.

  4. #24

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    Quote Originally Posted by SpontaneousOrder View Post
    Well even ignoring gravity, the clue was in your own posting. You kept saying 'relative to each other', but a man at the foot of a mountain and a man at the top are not moving at all, relative to each other.

    They're only moving relative to each other if you choose some arbitrary 3rd party frame of reference. So ignoring gravity there would be no time dilation at all.
    Ok supposing the man isn't on a mountain but flew in a fast jet Eastward (this is important I understand)? Would he experience time as slower to the man on the ground??
    Science isn't about why, it's about why not. You ask: why is so much of our science dangerous? I say: why not marry safe science if you love it so much. In fact, why not invent a special safety door that won't hit you in the butt on the way out, because you are fired. - Cave Johnson

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    Quote Originally Posted by gingerjedi View Post
    Ok supposing the man isn't on a mountain but flew in a fast jet Eastward (this is important I understand)? Would he experience time as slower to the man on the ground??
    East or west doesn't matter.
    Both would experience time as normal. But both would observe the other as 'passing through time' more slowly so long as both remain observing from an inertial frame of reference.

    If the jet did a u-turn and cam back then it would have spent the time taken to do the u-turn in a non-inertial frame, and as such the scenario falls outside the scope of 'special' relativity. In this case the jet pilot would see the other guy aging more slowly, and then as he performed the u-turn he'd see the other guy rapidly age so that he is now aged more than the pilot. Then during the return trip he's see the other guy age slowly again - but not enough to fully counter that period of rapid ageing. When the pilot gets back to the start both men will agree that the jet pilot has aged less than the stationary man.

  6. #26

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    Quote Originally Posted by xoggoth View Post
    Time doesn't really matter but our perception of it does. If you want to live forever just watch party political broadcasts over and over again.
    Wasn't there a character in Catch 22 who subscribed to a similar philosophy?

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