For the plane of the old moon—the place they had to go to find safe refuge in Cleft—was where all the rocks were. That was where the rocks had started out, at Zero, and for the most part that was where they had stayed. The ones that had fallen to Earth in the Hard Rain were only a tiny fraction of the lunar debris cloud: just a faint dusting compared to what remained up here. During most of Endurance ’s journey, her pilots had, by choice, kept her in that angled Baikonur-compatible plane, well clear of the moon’s debris field. Otherwise they could never have survived for this long.