[XBob]

please ask a specific question.

surely you know the TPS (thermal protection system) is made up of various types of materials, RCC, tiles, and blankets.

surely you have seen the first video of underside and the the impact as it occured, not just the popular video looking from the dorsal side of the orbiter at the foam dropping under the wing, then reappearing in snowflakes at the bottom.

[El Gato]

surely you have seen the first video of underside and the the impact as it occured,

I haven't seen that one. Do you have a link?