I hoping for some help here, as Google isn't being useful... In my early teens I read a novel about a young man who is quite adventurous in his society and in climbing and adventuring into the off-limit areas of his world, discovers his "world" is actually a giant spaceship (possibly an asteroid ship) transporting a colony to a new world and it is very near it's destination after hundred or thousands of years. Problem is that it has been so many generations now that no one even knows this is a ship any more, so he has to finish the journey himself, possibly with the help of an AI in the ship (sorry, memory is really foggy). Biggest problem is that is about all the details I can remember... This would have been about the mid-1980's and in paperback. This image by Roy Scarfo is what brought back my memory of the book, I am guessing the cover art of the novel was similar in some way. Answer It's not an uncommon concept, and there are many stories that may fit i...