Gant Nerley nodded. "It has been tried. No good. You see, Dusty, this was made by going deep into space and making stereograms from all angles. The transparencies are used in projectors all around the hall. But as you may know, the finest photogram loses definition when it is enlarged too much. As for delicate operations, Dusty, just to prove our point we are going to enter the model." Gant led them to a control panel in the railing and from a sheet of paper in his hand he set the dials. * * * * * The vast circular runway lowered all around the hall and the galaxy-model rose, giving the appearance of turning upward past them. "We are coming down toward and below the plane of our galaxy at the scalar rate of about a hundred thousand light-years per minute," said Gant. Then a segment of the catwalk detached from the wall and went forward on a long girder. The bright pinpoints leaped out at them, giving Dusty the same feeling as he had had in the space flight, except that the model lacked the waves of heat as the little pinpoints passed. He looked at Barbara and watched the tiny points plunge into her skin to disappear, then reappear behind her, as if they passed through her body harmlessly. He looked at his hand as the points streamed through, and he waggled his fingers around a cluster and watched them twinkle. They penetrated clusters and dark-cloud areas, placed where fifty stars occupied a volume of less than a couple of cubic inches, spots where dusky, shapeless masses represented globs of fifty light-years in diameter. Rusty caught on. Thoughtfully he looked at Barbara and made a rough computation that he and she were a couple of hundred light-years apart. His eyes, he thought, must be about thirty light-years apart, and the diameter of his head, at eight-and-a-third light-years per inch-- Dusty began to feel light-headed. Through and through the model ran the colored lines, tangled and skeined and then they were facing the point where the greenish-yellow course-line ended. Above the control panel was a faintly glowing sphere about two inches in diameter. "Sol?" asked Gant. Dusty shrugged. "Sol? How can we--"