太陽(Sun)形成的時間是介於45億至50億年前,屬於較晚期的恆星(初期形成的時間發生在宇宙大爆炸之後,由早期幾代的恆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黃色G型恆星,G型恆星是指含有介於0.8 -1.1个太陽質量 (solar masses),他們的地表燃燒溫度在攝氏5000度到攝氏5800度之間,這類型的恆星本身含有多種金屬和離子化的鈣。
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相關連結
1. Amara Graps of the Solar Center at Stanford explains that the sun is about 5.0 billion years old.
2. Suntrek’s page about the age of the sun.
3. A page about the sun with a fantastic collection of images of the sun.
4. The NASA Heliophysics web site.
5. An amazing SOHO spacecraft ultraviolet mpg video of the sun making one full revolution (over the course of about 21 Earth days).