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Thread: How do you reconcile the passage of time with the idea that time is relative?

  1. #1
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    How do you reconcile the passage of time with the idea that time is relative?

    Particularly with the expansion of the universe, which occurs at faster than light velocity?
    "Occam" is the name of the alien race that will enslave us all eventually. And they've got razors for hands. I don't know if that's true but it seems like the simplest answer."

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    It's like water flowing over rocks; the narrow streams have a higher pressure leading to higher speeds. The broad passages are more leisurely in their flow. But it's all moving water.
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    Quote Originally Posted by parallaxicality View Post
    How do you reconcile the passage of time with the idea that time is relative?
    Particularly with the expansion of the universe, which occurs at faster than light velocity?
    Can you be more specific? I'm not seeing the problem.

    Grant Hutchison

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    I’m also puzzled by the question. Time passes but is observer dependent due to relativity. What about the expansion of the universe is a concern?

    For everyday earthbound life it has little obvious effect, it’s no surprise relativity theory was only worked out in the early 20th century after discovery of very small discrepancies from expectations.

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    I'm thinking that your question kind of goes like..." Here we are all around the world, aging at the same rate of time.....but we aren't. If you live in a two story house, and have a clock that reads digital time to 12 sig figs....you'd see that you age faster on the second floor. It's the subtlety of relativity that you don't have to be concerned about it to plant 50 acres of wheat, harvest it, and bring the sacks of flour to your town baker.
    pete

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    Quote Originally Posted by parallaxicality View Post
    Particularly with the expansion of the universe, which occurs at faster than light velocity?
    Well, it's not expanding faster than light right here. That's only observed when you're looking at some object several billion lightyears away, from our vantage point. If you were situated on that distant object, the universe would not be expanding faster than light right there either.
    Everyone is entitled to his own opinion, but not his own facts.

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    Quote Originally Posted by Cougar View Post
    Well, it's not expanding faster than light right here. That's only observed when you're looking at some object several billion lightyears away, from our vantage point. If you were situated on that distant object, the universe would not be expanding faster than light right there either.
    Yes. Imagine a still pool of water. Now imagine water in a barrel being carted away by a speeding truck. Is the water in the barrel flowing, any more than than the water in the pool?
    "I'm planning to live forever. So far, that's working perfectly." Steven Wright

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    I'm also confused by the question. What is there to reconcile? For that matter, how could time be relative if it didn't pass? The passage of time is pretty fundamental to relativity.

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    Quote Originally Posted by parallaxicality View Post
    Particularly with the expansion of the universe, which occurs at faster than light velocity?
    I know I've already said this a few times on this forum in the last twenty years or so, so forgive me for repeating myself, but the units for expansion and the units for velocity are not the same, so you cannot say that the universe is expanding faster than light. It is a meaningless statement. You can say that because space seems to be doubling in size roughly every 10 billion years (measured now), that sufficiently distant parts of the universe are getting further away from us faster than light travels.
    Forming opinions as we speak

  10. #10
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    I am not a great specialist, but as for me, different units of change, measurement of different processes, it seems to me, should be assessed separately. And then you need to make some kind of comparison, in which process the big dynamics.

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