Expert Analysis: Will we be destroyed by asteroids like the dinosaurs?

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More and more evidence supports the theory that dinosaurs were wiped out by a giant asteroid. But unlike dinosaurs, we can do something about it. NASA just hit an asteroid in the world's first planetary defense test, and for the first time, humans moved an asteroid in space. Is the threat real? How can we defend ourselves? CGTN invited Yang Yuguang, vice chair of the IAF Space Transportation Committee, to give his answers.

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