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Monthly Notices of the Royal Astronomical Society 2009 , [ "Monitoring Stellar Orbits Around the Massive Black Hole in the Galactic Center"] in German , Astroph
Mao 2007 , [ "The Scale Height and Filling Factor of Warm Ionized Gas in the Milky Way"] in German , Bulletin of the American Astronomical Society 39 4 : pp "Pattern speeds in the Milky Way"

"Gas dynamics in the Milky Way: second pattern speed and large-scale morphology".

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"Discovery of HE 1523-0901, a Strongly r-Process-enhanced Metal-poor Star with Detected Uranium"
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It is about 25,000 light-years from the center of the galaxy, and it revolves around the galactic center once about every 250 million years
The sun is one of over 100 billion stars in the Milky Way galaxy ; Thom, Christopher; Beers, Timothy C

.

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