Liu Yang: Black, even a vast abyss cannot be described! Why does outer space look black?

The surroundings are particularly dark, the darkness that cannot be seen to the bottom, even the abyss cannot be describedThis sentence was spoken by astronaut Liu Yang in an interview with CCTV's "Face to Face" program at the beginning of this year. In fact, similar words are not the first time they have been spoken by Chinese astronauts, and Zhai Zhigang has previously described similar activities outside the spacecraft...

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