Colony ships would be massively difficult. Maybe even impossibly difficult? but the impossibility would be in the details and the effort. We'd be designing a

Colony ships would be massively difficult. Maybe even impossibly difficult? but the impossibility would be in the details and the effort. We'd be designing a very complex, very touchy system full of parts that could break. But... I'm just saying, there's nothing in our current understanding of science that makes it impossible, like faster than light travel, and the goal is clear; we'd know it when we finished it, unlike uploading humans.