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Sitting on a (very) extended object in space

  1. Dec 27, 2011 #1

    I imagine a very long rigid rod in space with length L.

    I assume that the center of mass of the rod will be at rest with respect to the Hubble flow - is that right?

    If I travel to one of the ends of the rod will I now see nearby objects that are moving with the Hubble flow move past me parallel to the rod with a velocity v = H_0 L/2 where H_0 is the Hubble constant?

  2. jcsd
  3. Dec 27, 2011 #2

    Simon Bridge

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    You can also do this by accelerating so the hubble red-shift for some distant object is zero. Then it comes as no surprise that you are moving with respect to the objects around you.
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