博文
好玩的科学网站
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1,
https://www.britannica.com/topic/stellar-classification
2,演讲 TED
https://open.163.com/ted/
3，coursera
https://www.coursera.org/
4，edX
https://www.zhihu.com/question/21095181
https://cn.udacity.com/
https://blog.sciencenet.cn/blog-2414991-1083387.html
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