NASA plans to crash a satellite into an asteroid

NASA’s Double Asteroid Redirection Test (DART) spacecraft, the American half of the international Asteroid Impact and Deflection Assessment (AIDA) Mission, has advanced to the preliminary design phase. If all goes according to plan, it will blast off from Earth in 2024. Its mission: to redirect a nonthreatening asteroid.

Its goal: to prove it can be done when and if a large one actually threatens to hit us...
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