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The Starliner’s base heat shield has an ablator, a proprietary material that absorbs energy on re-entry and only chars “like a marshmallow,” said David Schiller, leader of Boeing’s commercial crew aerostructures integrated product team.

The Starliner’s base heat shield has an ablator, a proprietary material that absorbs energy on reentry and only chars “like a marshmallow,” said David Schiller, leader of Boeing’s commercial crew aerostructures integrated product team.