I think humans may settle Mars within the next century or so. If the great distances between stars can be bypassed (i.e. a "warp drive" mechanism or something else) they will reach other star systems probably within a millennium or two.
shareWell I don’t think relativity prevents you from making a one way trip. You can never achieve the speed of light but you can get as close to it as you like. It would require massively greater increments of energy as the mass of the ship increased. Time for you would slow down the closer you got to the speed and you would age more slowly. But by the time you got there everyone on Earth would probably be dead.
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