太陽(Sun)形成的時間是介於45億至50億年前，屬於較晚期的恒星（初期形成的時間發生在宇宙大爆炸之後，由早期幾代的恒星所遺留下來之氣體和物質所組成）。太陽是一個體積在中等大小的黄色G型恒星，G型恒星是指含有介於0.8 -1.1个太陽質量 (solar masses)，他们的地表燃燒温度在攝氏5000度到攝氏5800度之間，這類型的恒星本身含有多種金屬和離子化的鈣。
友誼網頁連結
- Amara Graps of the Solar Center at Stanford explains that the sun is about 5.0 billion years old.
- Suntrek’s page about the age of the sun.
- A page about the sun with a fantastic collection of images of the sun.
- The NASA Heliophysics web site.
- An amazing SOHO spacecraft ultraviolet mpg video of the sun making one full revolution (over the course of about 21 Earth days).
友誼網頁連結
- Amara Graps of the Solar Center at Stanford explains that the sun is about 5.0 billion years old.
- Suntrek’s page about the age of the sun.
- A page about the sun with a fantastic collection of images of the sun.
- The NASA Heliophysics web site.
- An amazing SOHO spacecraft ultraviolet mpg video of the sun making one full revolution (over the course of about 21 Earth days).