The rings of Saturn stretched like a level sheet in all directions, though actually composed of millions of tiny bodies. Homer Timkin carefully braked with the nose rockets till he floated motionlessly with respect to the ring's own rotary motion around its primary. Then he eagerly donned his vac-suit. Had he struck it rich this time? Through his binoculars, a moment ago, he had seen the glint of one small jagged lump among the ring debris—and it had glinted like gold or silver. There was vast t