It is my understanding that an astronaut could get from earth to the far edge of the Milky Way within the length of a human lifetime if she were traveling close enough to the speed of light. From earth’s perspective, time would pass very slowly for her as she moved across the galaxy. From the spaceship’s perspective, the length of the galaxy would contract in her direction of motion with respect to the galaxy. Therefore, it seems to me that, from the astronaut’s perspective, the distance between earth and the far edge of the galaxy would be very short (comparatively speaking) in her direction of motion. But, of course, the number of stars in the Milky Way that she will pass on her journey will not change. How do all those stars fit in such a small space?