In reply to:

A word about the foam and tiles - it's the relative speeds that count.

What you wrote makes sense.

But there's still the commentary made on Sunday that a piece of foam hit the exterior rocket engine in a lift-off over a year ago and made a dent in the steel.

This foam issue isn't minor. From what I've been reading, experts have warned about the foam problem for years. Modifications have been been, but I haven't inferred in reading anything that there was ever consensus that foam was now a non-issue.

So back to the fine point you made about relative speed. If what you wrote is abolutely true, then how did a piece of falling foam insulation put a dent into an exterior steel rocket engine? I'm curious about how the relative speed factor didn't come into play there.