It's hard living next to a giant, even a friendly one, much less a clumsy hostile giant. Earth's unfriendly billions were an unpredictably restive presence. The Kingdom of Central was on the Moon, and the three allied habitats of Home were already forced to move from Low Earth Orbit to beyond the Moon, dancing around a common center in a halo orbit. That bought them some time, but wasn't nearly far enough away. The Spacers knew it would come to a bad end. The only question was how, when, and would they survive it? The only refuge was in the stars where they had friends.