Elite Dangerous already has more known star systems (160k) in the Milky Way than you can realistically visit - and the rest (400 billion) filled in with plausibly simulated systems:
https://elite-dangerous.fandom.com/wiki/Galaxy#Milky_Way - it even kind-of predicted a star system that was only discovered after the game was released:
https://elite-dangerous.fandom.com/wiki/Trappist-1#Impact_of...