Verse (67:3) "He(God) who created the seven tournaments (heavens) one imposed over the other..."
I read somewhere that one is bigger than the other but i don't remember the verse, if I'm remembering correctly.

Anyway, thought this is something we'll never find evidence of, but something interesting I read today which is giving implication that we have more than one universe and one into another like russian doll.

In this model, the universe is a kind of cosmic Russian Doll, with all previous universes contained within the current one.

That’s an extraordinary discovery: evidence of something that occurred before the (conventional) Big Bang.

Today, another group says they’ve found something else in the echo of the Big Bang. These guys start with a different model of the universe called eternal inflation. In this way of thinking, the universe we see is merely a bubble in a much larger cosmos. This cosmos is filled with other bubbles, all of which are other universes where the laws of physics may be dramatically different to ours.

http://www.technologyreview.com/view...her-universes/
Related reading: http://en.wikipedia.org/wiki/Islamic_cosmology