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Satellites Are Rife With Basic Security Flaws
(www.wired.com)
This is a most excellent place for technology news and articles.
I guess I wasn't clear, real time OS absolutely are in use (I just said real-time software). my point was that they aren't the same as what most people know and experience. attacking them isn't like attacking some random IoT device or "hacking" some random server or PC.
In my experience, people don't have a good idea of how satellites operate and articles like this one don't help.
btw, love your username!