銀河系(Milky Way Galaxy)是太陽繞行的星系，直徑大約80,000 光年, 厚度大約2,500 光年。銀河系裡有大約3000 億個星星。“銀河系中，不同的位置，有不同的年齡，最古老的部份約有110-130 億年, 銀盤約有60-110 億年。” (2007年7月，科特思威廉斯的話談銀河歲月工作坊。)
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相關連結
1. NASA’s Origins Education Forum has a discussion of galaxy formation.
2. The European Organisation for Astronomical Research in the Southern Hemisphere’s 2004 press release about the age of the Milky Way Galaxy.
3. Frommert & Kronberg’s web pages on The Milky Way Galaxy.
4. The Nicolas Dauphas method for calculating the age of the Milky Way Galaxy.
5. Some materials from the Age of the Milky Way Workshop held in July 2007.
This work by Eric & Chun-Chih Hadley-Ives is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.