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Around the main asteroid. so when you slam into the moon and you slightly change its orbit, we know the orbit so well now, we'll be able detect what kind of change happened to it afterwards. >> so the amazing thing is this thing was launched overnight. it's going to smash into this asteroid in october of next year. you have to be pretty good at math, right, to make that work? >> yeah. it's a bad ass move. here we are on earth, on a platform, you are aiming this space probe to a point in space ten months from now where the binary asteroid will be. and you will hit the moon that's going around i...

Math, right, to make that work? >> yeah. it's a bad ass move. here we are on earth, on a platform, you are aiming this space probe to a point in space ten months from now where the binary asteroid will be. and you will hit the moon that's going around it. and so this, yes, there is not enough praise given to the orbital dynamicists who figured this out. the craft weighs about 1,000 pound, much less than the mass of the moon, itself. but just enough to push it and change its orbital speed by one-half a millimeter a second. you say that's nothing. well, it adds up. say to yourself, if we find an...