When you looked outside, it was into darkness. Going out yourself, you could let your eyes accommodate. At high noon, the sun was a sharp spark in a dusky heaven, and its light amounted to about one-ninth of one percent of what Earth gets. The great fields of ice and frozen gases reflected enough to help vision, but upthrust crags and cliffs of naked rock were like blackened teeth. Seventy hours later, when Triton was on the other side of the primary that it always faced, there was a midnight th