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. “
See the full article here.