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The earth and not set to hit the earth in the near future. that makes them an appropriate target. >> reporter: dart will then deliberately crash into the moonlet to try to jolt if from its regular orbit. scientists will use satellite imagery and ground based telescopes to see how much the moonlet changes coarse. >> if one day an asteroid is discovered an a collision course with ether we'll have an idea how fast it's coming and when it will hit, that kind of information we'll have an idea how much momentum we'll need to make that asteroid miss the earth. >> reporter: the targeted moonlet is a l...
Source: archive.org