Jules would be one of those people who has never heard of "Earth," though at least he wouldn't be surprised to learn there's another plant out there. He's aware those within the United System can't be the only ones.

"People specifically, no, but you're in for a rude awakening if you think this place is remotely safe. My life isn't at risk quite as often as at home, but that says very little considering at home there was usually an attempt on my life every single day. Here this place itself is just constantly trying to kill us."

Which is almost worse given Jullien can't kill a place to protect himself.