Comment Re:1 week's warning (Score 1) 68
The implied point is that perhaps we should be putting some effort into getting more warning and finding all the dino killers (and frankly, stuff a lot small than that rock was).
That is in fact what NASA has been doing for the past two decades: http://neo.jpl.nasa.gov/stats/ They have found about 90% of the 1-km or larger class. Chixulub the dino killer is estimated at 6 km, and impact energy scales as the cube of diameter. Unfortunately, asteroid tracking doesn't help with long-period comets. Those come in from the dark reaches of the outer Solar System, and therefore cannot be found until they are within a couple of years of hitting us.