Moz
Moz asked Andy Weir:

This is an obvious question but how much of the technology has been invented already and how much is just theories?

Andy Weir Almost all of the technology portrayed in the book actually exists. However, the tech in the book is often much more efficient than its real-world equivalents.

There's one exception: In the book, there's a thin, lightweight material that blocks solar radiation. Nothing like that actually exists.
Andy Weir
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