 What motivates Pop Young to live on the far side of the moon?
Once in two weeks Earth-time a rocketship came around the horizon from Lunar City with stores for the colony deep underground. There were air-tight bulkheads for safety, and a hydroponic garden to keep the air fresh, and all sorts of things to make life possible for men under if not on the Moon. In the Moon's slight gravity, a man is really adjusted to existence when he has a well-developed case of agoraphobia. Writing-material was scarce, but he spent most of the time between two particular rocket-landings getting down on paper exactly how a child had looked while sleeping, some fifteen years before.
 He is close to Sattell's location, which enhances his memories of his wife and children
 He is being compensated for a wrongful death suit that occurred back on Earth  He is close to Sattell's location, which enhances his memories of his wife and children  If he left his post, there would be no one to monitor the mines in the Big Crack  If he returned to Earth, he would be arrested for the murder of his family