It has to do with how scientists have been able to piece together what the known universe looks like based on observations from right here on Earth.
He provides some interesting data about dark matter and how clusters of galaxies tend to clump together due to the effects of gravity and dark matter over the course of billions of years. He sites data taken from the WMAP satellite and talks about the new Planck satellite that is due to launch later this (or next?) year.
Oh and I didn't realize that the Milky Way Galaxy is somewhat alone in the universe, or more aptly described, it isn't surrounded by large clumps of galaxies like much of the rest of the observable universe- but I'll let him describe that as he does a much better job.
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