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Haven't we thought about the possibility of only a region of the universe is expanding?

What about space is expanding in this region and space is compressed in another region, that satisfies the conservation law of space, no space can be created or destroyed.

So we can't be sure that the whole universe is expanding but we know that space as far as we can measure is expanding. Am I right about that?

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    $\begingroup$ What conservation law of space? $\endgroup$
    – ProfRob
    Commented Apr 10, 2015 at 22:51
  • $\begingroup$ @RobJeffries Total amount of space remains constant. $\endgroup$
    – Jossi
    Commented Apr 11, 2015 at 11:09
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    $\begingroup$ I'm unaware of such a conservation law. $\endgroup$
    – ProfRob
    Commented Apr 11, 2015 at 12:08

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This is a commonly considered idea, of which one variant is the "Hubble bubble". Anything that happens outside of the visible universe, is, after all, in principle unknowable to us.

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