銀河系(Milky Way Galaxy)是太陽航繞的星系，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。“在銀河系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。)
連結網頁
- NASA’s Origins Education Forum has a discussion of galaxy formation.
- The European Organisation for Astronomical Research in the Southern
Hemisphere’s 2004 press release about the age of the Milky Way Galaxy.
- Frommert & Kronberg’s web pages on The Milky Way Galaxy.
- The Nicolas Dauphas method for calculating the age of the Milky Way Galaxy.
- Some materials from the Age of the Milky Way Workshop held in July 2007.
連結網頁
- NASA’s Origins Education Forum has a discussion of galaxy formation.
- The European Organisation for Astronomical Research in the Southern
Hemisphere’s 2004 press release about the age of the Milky Way Galaxy.
- Frommert & Kronberg’s web pages on The Milky Way Galaxy.
- The Nicolas Dauphas method for calculating the age of the Milky Way Galaxy.
- Some materials from the Age of the Milky Way Workshop held in July 2007.