More than 1,000 exoplanets have now been confirmed and cataloged (PHL @ UPR Arecibo)
Since travelling faster than light will probably never be possible, people assume that humanity can never defeat the distance to a habitable planet in a another solar system.
But if it is looked at strictly as a matter of travel time, then the technology for moving to another terran planet is almost within our reach already.
Yes, we have to accept that those who left our system will never arrive at the destination — but their descendants many generations down will.