Generation Ships

Generation Ships are huge ships, designed to carry and support a small society.

History
In the mid 21st century, the first true expansion into space by humanity lead to scientists to devise ways to populate distant systems, considering the dangerous and still relatively slow speed of travel available to them at the time.

Generations ships were the answer. Able to sustain a large population for several generations and all the equipment they needed to establish a colony once they found a habitable system.