Thanks for the welcome. I forgot to list my source in my last post so here it is:
http://deepimpact.jpl.nasa.gov
My guess to the explosive statement is that NASA gives a TNT equivilent in kinetic energy. An explosive tipped impactor would give very false readings when looking for crater size. I guess in all those years as an Army combat engineer I did learn something. #-o

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So many things I think about when I look far away,
Things I know, things I wonder,
Things I'd like to say. - RUSH - Mystic Rythums