Mimas was a cold little world where the sun's rays seldom reached. You stayed under a big glassite dome on the four-hundred mile sphere if you stayed there at all, and you hardly saw the sun anyway because Saturn and its rings were so big and so bright. The temperature under the dome was kept in the forties because Mimas was a summer resort, provided you wanted to travel three quarters of a billion miles to leave the heat and the bustle of the inferior planets behind you. It was cold, but Mr. S.