NASA plans to crash spacecraft into an asteroid to test planetary defence system

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NASA is planning to crash a spacecraft into an asteroid in 2022 to see if its impact will change the asteroid’s course. That’s even though Earth faces no such immediate danger. The Double Asteroid Redirection Test (DART) is the space agency’s first test mission of a planetary defence system. According to NASA’s website, no known asteroid larger than 140 metres in size has a significant chance to hit Earth for the next hundred years.

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