AFter the NASA briefing late Sunday afternoon, a specialist stated that a piece of insulating foam had broken off during lift-off over a year ago, had hit an exterior rocket engine made of steel, and had dented the steel.

This foam is a lot harder than most of us would first imagine--and traveling at between 1200 and 2000 mph during the earlier phases of lift-off would give this hard foam a lot of force upon impact.

I have not heard Dittemore say that NASA has cast out the foam hitting the underside tiles theory altogether. I thought NASA has gone back to the drawing board to see whether they could have miscalculated the force of the foam. If that foam can leave a sizable dent in steel, it ain't no small force.