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Thread: I have different red-shift question

  1. #1 I have different red-shift question 
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    If space is expanding because SPACE is moving, not the objects in it,,,, then it is possible for the objects far away from us are moving away from us faster than light,,,,,

    but if this is because they are NOT moving ACROSS SPACE,,, then HOW do we perceive a red-shift from the expansion???

    IF at all times the light is simply travelling across normal space at normal speed, and the objects in space are not moving ACROSS SPACE apart from each-other, then the light should simply cross MORE SPACE, not impact our telescopes as though we are moving away from the light,,, therefore this expansion,,,, how can it result in red-shift???





    Last edited by tsmspace; July 31st, 2019 at 03:59 AM.
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    Brassica oleracea Strange's Avatar
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    Quote Originally Posted by tsmspace View Post
    If space is expanding because SPACE is moving, not the objects in it,,,, then it is possible for the objects far away from us are moving away from us faster than light,,,,,
    Yes, we can see galaxies that are receding faster than light.

    but if this is because they are NOT moving ACROSS SPACE,,, then HOW do we perceive a red-shift from the expansion???
    So the red-shift is not the same as the Doppler shift (which is due to relative motion). It is caused by the fact that the universe has expanded since the light was transmitted (not by the recessional speed). You can think of it as the wavelength of the light also being "stretched" as the universe expands.


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