About ten o'clock
There was n't much to talk about . About nine o'clock the boys stopped and opened one of the containers of food and ate a quick meal of sandwiches . This was followed by a carefully measured ounce of water , and fifteen minutes later they resumed their march across the New Sahara . About ten o'clock , Deimos , one of the small twin moons of Mars , swung up overhead , washing the desert with a pale cold light . By morning , when the cherry-red sun broke the line of the horizon , Tom estimated that they had walked about twenty miles . `` Think we ought to camp here ? '' asked Astro .