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The skim is 3.6 million miles away by astro lodg logical stas that is in the neighborhood. scientists using high powered telescopes can look at its moon and check out the surface features and even check the rotation. listen. >> it really brings out these are their own little worlds and they all are very interested -- very interesting in the shape, size and spin di dynamics and e close approach will show us what this is like. all important data to collect for potential future exploration. >> but not just future exploration. this gives scientists a chance to really some day save the world by bui...

Desk. harris? >> jon, it is out and it is impressive. the first radar video of the asteroid that came within 17 miles of earth, skintight close, relatively speaking when you consider the size of the universe that is. on friday when it came closer to us than any of our communication satellites or many of them, nasa's deep space radio network antenna in california was ready to capture it. look at this. this is as the asteroid was moving away from earth. this is not as close as the nearest point. 72 images were captured. the pictures were taken as it was a bit farther out but still giving us a de...