📁 太阳能系统
The Solar System currently consists of the Sun, nine planets, and the many asteroids and comets that also orbit the Sun.
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条目 (2+)
Arabic Mathematics: Forgotten Brilliance?
http://mathshistory.st-andrews.ac.uk/HistTopics/Arabic_mathematics.html
Auroras: Self Guided Tour
http://www.exploratorium.edu/learning_studio/auroras/happen.html