@EffreyJepstein >fault tolerant system using older computers because the high transistor size is beneficial in space.
Not really, the transistor size makes only a minor difference - you rather need radiation hardened processors.
Radiation hardened designs tend to lag a few "generations" behind, as they take a while to implement, plus you can only really get such small batches done on fabs of a larger node size.

>is the absolutely proprietary nature of anything going to space, but apparently SpaceX got Linux past the FAA and NASA so maybe more satellites will start using Linux
Linux is proprietary software, so yes it's all proprietary.

Linux isn't a realtime kernel (even with the "realtime" patchset), so it's not suited for use in satellites.