This is the challenge posed by the Project Hyperion Design Competition ... designing a hypothetical generation ship for interstellar journeys that would sustain humanity on a 250-year voyage.

is calling for submissions for the design of a crewed interstellar generation ship. The project is part of study that is aiming to provide an assessment of the feasibility of crewed interstellar ...

"Chemical rockets that we use today, even with the extra speed boost from flying by planets, or from swinging by the sun for a boost, just don't have the ability to scale to useful interstellar speeds ...