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3 years agoin systemd runlevels are basically just targets (it still sets rc?.d symlinks in /etc akaik) which have services they want and are wanted by, it’s the basis for dependency handling plus you get cool security features like syscall filtering, capability limits, user switching, etc
If it’s not seen as much, that probably means the green material is heavier than iron. It’s less common, but large enough stars can fuse even heavier elements. That’s where all those elements on Earth came from in the first place.