Musk has stated that the BFS will need a heat shield capable of reentering the atmosphere from interplanetary trajectories. So I take it the ship will come in directly from the transfer trajectory and rely on arobraking to slow down to land.

Main part of question: what will the heat shield be made of?

Bonus: What speed would a return from mars have? Thoughts on the heat it would produce in contrast to earth orbital return.

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    $\begingroup$ All signs currently point towards an upgraded version of SpaceX's PICA-X material used on the dragon 1 and 2 capsules which, itself, is already an upgrade from the NASA-developed PICA material. spacex.com/news/2013/04/04/pica-heat-shield However SpaceX has not made public exactly what the BFS heat shield will be made of. $\endgroup$ – Dragongeek Feb 12 '18 at 7:59

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