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Old February 28th 18, 08:51 PM posted to sci.astro.research
John Heath
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Posts: 13
Default Big Bang question

There are 2 rocks in space. As a result of big bang the universe
is expanding. Is it the vacuum that is expanding therefor the
distance between the rocks or is it the vacuum and the size of the
2 rocks that is expanding. That's it . Did not want to clutter this
question with too many details . Is it the vacuum or is it the
vacuum and the rocks that are expanding?

[[Mod. note -- This is a FAQ, and is one of the entries in Ned Wright's
excellent "Frequently Asked Questions in Cosmology":
http://www.astro.ucla.edu/~wright/cosmology_faq.html
-- jt]]