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Carl sagan famously said that the universe
The third chapter, Carl Sagan's universe. In the vast space and infinite time, I am honored to share the same planet and time with you, selected from the third book, Carl Sagan's Universe. Philosophy refers to the universe, that is, all space, time, matter and everything it produces. It is the totality of matter, the biggest research object of physics and astronomy, and it is also called the world in philosophy.