From Wired Science: “Milky Way Galaxy Has Mirrorlike Symmetry” 

This is copyright protected, so, just a glimpse.

By Ron Cowen, Science News
May 21, 2011

“A new study suggests the Milky Way doesn’t need a makeover: It’s already just about perfect.

Astronomers base that assertion on their discovery of a vast section of a spiral, star-forming arm at the Milky Way’s outskirts. The finding suggests that the galaxy is a rare beauty with an uncommon symmetry — one half of the Milky Way is essentially the mirror image of the other half. “

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See the full article here.