Is it at least theoretically possible to hack into government satellites, or nuclear missile silos?.
no to either of them lol... The only way you would be able to do it is if you had physical access to the closed loop systems that they use (so unless you are somehow inside a nuclear silo or in outer space, you cant hack them). hacking in the real world is vastly different from in movies lol just because its in a movie doesnt mean its possible in real life...
Government satellites, probably because they likely use some sort of wireless communication. I'm not sure to what degree you'd be able to control it though. That likely varies. Also, I'd assume there is some sort of barrier to being able to gain access, such as command encryption. Nuclear missile silos, not a chance. Their important systems will be physically disconnected from the internet and not dependent on external sources.
