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Just what the question says. As the universe expands, and space expands, do objects like planets ever expand? Does the space INSIDE of those objects expand?

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    $\begingroup$ Things that are bound by some force (planets bound by gravity, etc) stay the same. Things that are unbound will drift apart. $\endgroup$ – Florin Andrei Mar 21 at 17:30
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    $\begingroup$ Nice question, probably it was asked already many times :-) The important thing is: we can't measure anything absolutely. All measurement compares something to another thing. Thus, if everything would expand, we couldn't measure it. How? All of our measuring devices would also expand. $\endgroup$ – peterh says reinstate Monica Mar 21 at 17:40
  • $\begingroup$ Closely related: astronomy.stackexchange.com/questions/11726/… $\endgroup$ – PM 2Ring Mar 21 at 18:45
  • $\begingroup$ See also: astronomy.stackexchange.com/questions/104/… $\endgroup$ – mtewes Mar 22 at 11:30
  • $\begingroup$ I think it's the latter, Keith. $\endgroup$ – John Duffield Mar 22 at 17:49

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