›VIDEO: NASA launched its first-ever test mission to defend Earth from asteroids
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news01:14VIDEO: NASA launched its first-ever test mission to defend Earth from asteroidsOn November 23, NASA launched a mission to test deflecting an asteroid from colliding with Earth. The pr...obe, known as DART, is expected to intercept an asteroid 6.8 million miles away in late 2022. If successful, it could become part of NASA's planetary-defense strategy.