太阳(Sun)形成的时间是介于45亿至50亿年前，属于较晚期的恒星（初期形成的时间发生在宇宙大爆炸之后，由早期几代的恒星所遗留下来之气体和物质所组成）。太阳是一个体积在中等大小的黄色G型恒星，G型恒星是指含有介于0.8 -1.1个太阳质量 (solar masses)，他们的地表燃烧温度在摄氏5000度到摄氏5800度之间，这类型的恒星本身含有多种金属和离子化的钙。
连结网页
- 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).
连结网页
- 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).