The sun is one of over 100 billion stars in the Milky Way galaxy | 2009 , [ "Monitoring Stellar Orbits Around the Massive Black Hole in the Galactic Center"] in German , Astroph |
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"Gas dynamics in the Milky Way: second pattern speed and large-scale morphology" | 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 |
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"Pattern speeds in the Milky Way" | 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 |
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