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there are some 700,000 astroids in our solar system. there are about 25,000 that are bigger than a mickey mantle home run, 450 feet, or more. if you get at that size an astroid which goes undetecundet it s lights out for the world. so this is real important. it s improbable but possible. and we have to worry about the consequences of an astroid hitting the earth. it s fascinating. and i know what a great writer you are. just as a kid saying nothing was bigger than a mickey mantle home run. that s just a child s eye view. thank you so much, bill cohen. coming up, a perfect segue. top of the world, a look at how nasa is tracking climate change north of the arctic circle. you re watching andrea mitchell reports. stay with us on msnbc. duncan just protected his family