Yes, that part's true in both worlds. He's well known in both places.
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It would take something very powerful to take out a whole system. Even the Death Stars could only take one planet at a time. Add in whatever this First Order thing is and the Sith rumors, and it sounds like a difficult place. It's difficult back home, but not from the Sith...there's an invasion from outside the galaxy going on. It looks like we can't get away from danger. I'm definitely on guard and so is Luke.