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Thread: Shouldn't the slowing down speed of universe expansion be obvious?

  1. #1 Shouldn't the slowing down speed of universe expansion be obvious? 
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    As you look at galaxies further and further away, they appear to be moving faster and faster away from us, doesn't it also mean that galaxies that we see more in a past are moving away faster then the ones we see closest to the present time. Why cant we then conclude the obvious from it, that the Universe is slowing down in expansion.


    I have learn't about Universe actually increasing its speed of expansion. But isn't the true answer obvious from a fact I have just mentioned, and that they must have made an error in measurement.


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  3. #2  
    Moderator Moderator Markus Hanke's Avatar
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    Quote Originally Posted by Mohika View Post
    As you look at galaxies further and further away, they appear to be moving faster and faster away from us, doesn't it also mean that galaxies that we see more in a past are moving away faster then the ones we see closest to the present time. Why cant we then conclude the obvious from it, that the Universe is slowing down in expansion.
    I have learn't about Universe actually increasing its speed of expansion. But isn't the true answer obvious from a fact I have just mentioned, and that they must have made an error in measurement.
    Not sure if you are aware of this, but everything appears to be moving away from everything else, not just from us.
    Note the highlighted bit - this is because in actual fact nothing is moving, it only appears that way because the space in between is expanding. The galaxies themselves are locally stationary, or nearly so.


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    Anti-Crank AlexG's Avatar
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    When we look at a galaxy thats 10 billion light years away, we're looking at something which has been receeding from us for 10 billion years. The longer something has been receeding, the more space is created between us and it, and so the faster the recession. The light that we're seeing started on it's way 10 billion years ago, which is why we see a younger galaxy, but it's been travelling for 10 billion years.
    Its the way nature is!
    If you dont like it, go somewhere else....
    To another universe, where the rules are simpler
    Philosophically more pleasing, more psychologically easy
    Prof Richard Feynman (1979) .....

    Das ist nicht nur nicht richtig, es ist nicht einmal falsch!"
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    OK ... but if space time is accelerating on its expansion .. shouldn't we see the opposite .. that closest galaxies to the present are "appearing to be moving" faster from us then ones we see more in a past?
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    Anti-Crank AlexG's Avatar
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    The expansion of the universe is due to the 'stretching', or creation, of space between everything ( not gravitationally bound). Which means that the more space that exists between objects, the more space will be streched. Since there is more space between the furthest galaxies and us, they recceed faster. When we say the expansion is accelerating, what is meant is that the rate at which space is being stretched is increasing.
    Its the way nature is!
    If you dont like it, go somewhere else....
    To another universe, where the rules are simpler
    Philosophically more pleasing, more psychologically easy
    Prof Richard Feynman (1979) .....

    Das ist nicht nur nicht richtig, es ist nicht einmal falsch!"
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  7. #6  
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    I understand now ... and we couldn't even notice anything different even if its accelerating almost no matter how fast .. cause light beam from a distant galaxy also has to travel thrum same acceleration to reach us in a present.
    Last edited by Mohika; November 4th, 2012 at 03:38 PM.
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