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But that makes it a much more costly operation (both in money and risk). Even a nearby star system with a habitable planet would be hard to get going because th

But that makes it a much more costly operation (both in money and risk). Even a nearby star system with a habitable planet would be hard to get going because the settlers that go there would be cut off from their home planet. They would need to take with them everything necessary not only to establish a colony but to thrive (and stave off potential extinction level events which, when your population is small, is far more likely). And there would be little help from homeworld. Even information would take at least the speed of light to get there. And this is just the tip of the ice berg. I agree with jandrese that people underestimate just how much of a hurdle this is.

jandrese 6y ago
“Space is big. You just won't believe how vastly, hugely, mind-bogglingly big it is. I mean, you may think it's a long way down the road to the chemist's, but that's just peanuts to space.” ― Douglas Adams, The Hitchhiker's Guide to the Galaxy When talking about interstellar distances people just aren't equipped to think about the scales involved. They're so far outside of the scale of human experience that our brain really struggles to understand the magnitude of the problem. We're talking about billions of dollars to set up a short term test camp on Mars, and by interstellar standards that is close to nothing.