One thing we're missing is propulsion technology — we don't have warp drives or hyperdrives to carry us faster than the speed of light. Yet, anyway. One way to get us out into the universe without that kind of propulsion is to build a multi-generational ship. What are these generation ships, and should we think about creating them?
What Are Multi-Generational Ships?
As their name suggests, these ships are massive constructs designed to house multiple generations of humans, as well as survival necessities. Without faster-than-light propulsion, reaching a distant planet or solar system will take hundreds of years. The ship must be self-sustaining, providing oxygen, food, water, light and gravity throughout the journey. What sort of challenges should these intrepid interstellar humans expect to face during their trip?