At long last, the audiobook version of Scratching the Surface has been approved and is now available. Read by Emily Lakdawalla, Senior Editor and Solar System Specialist for The Planetary Society, the audiobook includes a downloadable pdf containing illustrations and background material.
https://www.amazon.com/Scratching-Surface-Generation-Mars-Prelude/dp/B08CDVG5NR
https://www.audible.com/pd/Scratching-the-Surface-Audiobook/B08CDW2BLN
Also available from iTunes!