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Arrakis is not located in another galaxy, and you don't see any Tatooine people running around with blue-in-blue eyes, or any mention of spice. People seem able to exist there quite well without benefit of stillsuits, there are no worms cruising around the desert, and Arrakis doesn't have any nonhumans that remotely resemble those found on Tatooine.
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None of that seems much of a barrier to an imaginative writer. I don't know what "another galaxy" means...that gets relative pretty quick, I'd say. But how many Tatooine people did we see? A few little mongers here and there. Who knows whether there is not deeper desert somewhere else on the planet. I would see Luke's family as colonists from elsewhere anyway. And we see at least two different races...who says there aren't more? Suits shouldn't be all that necessary near irrigation equipment. Another great planetary secret/irony...there was water way down there all along, but it took some hi-tech gringos to come find it and drill it up.