I heard about that. I was also watching somthing on the national geographics channel where they said the united states is the only county spending money on tracking astroids and coming up with ways to move them if one ever does get on a crash course with the earth. Still its only a 4 million a year program and the scientist said they only know the where abouts of 40% of the astroids that cross eaths orbital path every year. so one could hit us at any moment and we may not have even seen it coming.