"Well, they evolved there. That's where every member of their species ultimately originated from, even if, after they gained space travel and were able to go to other planets as a result, plenty of individual members spent their entire lives on other planets and never even visited," Garth'zel points out.
"Korriban's a planet with a... very heavy Dark Side presence. You're likely to find it uncomfortable. I'm used to it and can filter it out." Not. That he's planning on taking Anakin there anytime soon. "Anyway, the Sith I'm familiar with species-wise isn't actually the original version. Some Jedi who got kicked out of the Order settled there and basically took control of the planet. They and members of the original inhabitants used Sith alchemy to interbreed since humans and the Sith weren't genetically compatible enough to produce offspring without outside help.
"So I'm used to their descendants, who had traits from both. It'll probably be easier to show you holos so you can see what they looked like. Anyway, basically, they pretty much bred themselves out of existence. Someone with visible traits from the Sith part of their parentage having children with a human, those children having children with another human, further watering down their genetics, and so on. I wouldn't be the least bit surprised if humans from planets that were within the Empire still had traces of Sith ancestry, but after this amount of time, you wouldn't be able to tell by looking at them."
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"Korriban's a planet with a... very heavy Dark Side presence. You're likely to find it uncomfortable. I'm used to it and can filter it out." Not. That he's planning on taking Anakin there anytime soon. "Anyway, the Sith I'm familiar with species-wise isn't actually the original version. Some Jedi who got kicked out of the Order settled there and basically took control of the planet. They and members of the original inhabitants used Sith alchemy to interbreed since humans and the Sith weren't genetically compatible enough to produce offspring without outside help.
"So I'm used to their descendants, who had traits from both. It'll probably be easier to show you holos so you can see what they looked like. Anyway, basically, they pretty much bred themselves out of existence. Someone with visible traits from the Sith part of their parentage having children with a human, those children having children with another human, further watering down their genetics, and so on. I wouldn't be the least bit surprised if humans from planets that were within the Empire still had traces of Sith ancestry, but after this amount of time, you wouldn't be able to tell by looking at them."