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The limitless content of our universe might be only one instance of a large (and possibly infinite) number of other universes.

There was a time when 'universe' meant 'all there is.' Everything. The whole shebang. The notion of more than one universe, more than one everything, would seemingly be a contradiction in terms.

The idea that there could be other universes out there is really one that stretches the mind in a great way.

Philosophically, the universe has really never made things in ones. The Earth is special and everything else is different? No, we've got seven other planets. The sun? No, the sun is one of those dots in the night sky. The Milky Way? No, it's one of a hundred billion galaxies. And the universe - maybe it's countless other universes.

Another feature that everybody notices about the universe is that it's complex.

After all, you put a lot into creating a universe and everything that goes with it, and it seems a shame to use it only once.

The universe is one of God's thoughts.

According to 'M' theory, ours is not the only universe. Instead, 'M' theory predicts that a great many universes were created out of nothing.

There may have been many big bangs, one of which created our universe. The other bangs created other universes.

The world is a holographic universe, with every piece containing the whole.