[URL unfurl="true"]http://www.aps-pub.com/proceedings/1484/480406.pdf[/URL]

Here's a nice summary of a interesting recent model of the universe called the cyclic universe.

Basically the most popular universe model is the inflationary model the cyclic model is newer. There will soon be expiremental evidence to lean in favor of one or the other which is exciting.

[URL unfurl="true"]http://en.wikipedia.org/wiki/Cosmic_inflation[/URL]

The scary part about inflation is then it might be possible that one day our universe is so spread out an so vast and so cold that nothing could ever exist ever again within it. The cyclic universe is more intuitively pleasing. But regardless they are up for debate.