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Open your eyes, look up to the skies

(2020-05-30 13:11:16) 下一个

1. 

Carl Edward Sagan (/?se?ɡ?n/; November 9, 1934 – December 20, 1996) was an American astronomer, planetary scientist, cosmologist, astrophysicist, astrobiologist, author, science popularizer, and science communicator. He is best known as a science popularizer and communicator.

2. elon musk推特：

https://twitter.com/elonmusk?ref_src=twsrc%5Egoogle%7Ctwcamp%5Eserp%7Ctwgr%5Eauthor?

 

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