银河系(Milky Way Galaxy)是太阳航绕的星系，直径大约80,000 光年, 厚度大约2,500 光年。银河系里有大约3000 亿个星星。“在银河系不同的位置有不同的年龄，最古老的部份约有110-130 亿年, 银盘约有60-110 亿年。”
(2007年7月，科特思威廉斯的话谈银河岁月工作坊。)
连结网页
- 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.
连结网页
- 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.