Gateway (Heechee Saga, #1)
Comments and mentions from HN threads:
Ask HN: What are your favorite books of all time, and why?
roryisok: Pulp sf at its best. Humans discover a hollowed out asteroid worth ftl ships preprogrammed with unknown destinations. Prospectors pack as much food as they can and hit 'launch' in the hopes that they'll discover something valuable and not land on a star or starve to death.