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>Is Snoke explained?

>How does the Emperor survive the ending of Return of the Jedi?

He's a genetically altered clone descended from a race of space navigators who helped the Empire navigate the Unknown Regions. He was nothing more than Palpatine's meat puppet he controlled from afar. That's seriously his retconned origin.Barely ever explained, if at all. It's implied that his reformed body is a cybernetic vessel that houses his spirit + thousands of Sith spirits before him like some kind of crucible. He's attached to a robotic arm in an underground cyberpunk lab on Exogol.