You don't need FTL to go to nearby stars. If you built something that traveled at 1% c to the star 5 years away, and then took 500 years to develop enough to la

You don't need FTL to go to nearby stars. If you built something that traveled at 1% c to the star 5 years away, and then took 500 years to develop enough to launch colony ships of its own, the descendants would cover the entire galaxy from any starting point in 20 million years.