Comment Wear and tear. (Score 1) 174
The habitable parts of the ship would have to be rotating to provide artificial gravity. But what would wear and tear be like after 100 years? 200? Can we even build a machine to last 400 years? How can we launch such big parts and get them into space? And I can not imagine being stuck on a ship for your remaining lifespan. Would AI be used to educate the crew?