There's a very interesting Slashdot interview with Charles Seife, who writes for Science magazine and is the author of "Alpha and Omega: The Search for the Beginning and End of the Universe". Charles gives a detailled round-up on the current state of cosmology, the study of the universe.
It's rather strange to see that some of the problems of 30 years ago, still exists. Such as the question on the infinity of space. There are people who believe that space is (mathematical) infinite. However, in that case, it is very possible (almost certain) that in this infinite universe, there's a mirror of you reading this mirror website on a mirror internet, located on a mirror earth, located somewhere else in space. The question of parallell worlds is nicely described in this Scientific American article, about the so-called multiverse.
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Some other articles
Here's Scientific American carrying a new article about the multiverse case.