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and change its path. this space rock poses no threat, but it's a chance to show how we could deal with one on a collision course with the earth. the double asteroid redirection test is, first and foremost, a test. it is a test on an asteroid that is not a danger to earth. there is nothing we can do to it that will make it a danger to earth, and we are doing this now when we don't have to do in order to develop the capabilities to deflect an asteroid if we ever should need to in the future. three, two, one... and lift off, of the falcon 9 and dart. the spacecraft launched last year and has travelled nearly seven million miles. after the first stage, you see those engines coming to life... _ now it's nearing its destination. its target is a small space rock called dyomorphus that's orbiting a larger one. travelling at 11l,000 mph, the spacecraft will crash into dyomorphus, giving the asteroid a kick.