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Are the velocities we measure from the expansion real velocities? Why or why not?

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Are the velocities we measure from the expansion real velocities? Why or why not?

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  1. No, only the magnitude of separation changes.


  2. By definition of comoving coordinates, special relativity does not apply to the relative velocity between comoving objects due to expansion.

    I believe this is wrong; the comoving coordinate system is a mathematical fantasy and not analogous anything in the physical universe.

    If you're a mathematician, please respond to my Q on the subject; link below.

  3. expansion of what?

    .
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