Joe - Yes, please go ahead quote me. - Kurt P.S. - For impact damage, there would also be the "light dusting" (applet's language) of 1.5 inches diameter rocks [traveling at near the speed of sound]. Link to applet authors' journal article about the applet. http://impact.ese.ic.ac.uk/ImpactEffects/effects.pdf P.P.S. - You might also want to remind the 2012 conspiracy theorist types that NASA was reduced to risk of the Aphosis impact in 2032 to a non-event like 1-in-250,000. http://www.nasa.gov/home/hqnews/2009/oct/HQ_09-232_Apophis_Update.html Similarly, some 2012 conspiracy theorist types are hyping 433 Eros, an asteroid that NASA landed a probe on in 2000, as an impact threat in 2012. In January 2012, 433 Eros will pass at 70 lunar distances from the Earth - in other words no chance of impact. See http://en.wikipedia.org/wiki/433_Eros