NASA launches 1st-ever practice mission to defend Earth from asteroids NASA is launching its first-ever practice mission to redirect an asteroid. The launch is part of a planetary defense strategy if an object ever threatens Earth in the future.

November 24, 20214:26 PM ET

NASA launches 1st-ever practice mission to defend Earth from asteroids

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NASA is launching its first-ever practice mission to redirect an asteroid. The launch is part of a planetary defense strategy if an object ever threatens Earth in the future.

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