Monthly Notices of the Royal Astronomical Society | |
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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 | 2009 , [ "Monitoring Stellar Orbits Around the Massive Black Hole in the Galactic Center"] in German , Astroph |
"Pattern speeds in the Milky Way".
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 | ; Thom, Christopher; Beers, Timothy C |
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