. # 18 The Pinwheel galaxy, M33. If you use your imagination again (astronomers do that a lot), and put a stick vertically to the center of the galaxy, it may look like a small decoration you may see in someone's yard that turns around, like a pinwheel, when the wind blows. Even more so than M31, the image was computer-enhanced to see the spiral arms. M33 is about the same size and distance away from us as M31. #18 from IMG0014.pcd, taken 09/10/93, f/6.3, ASA 100, 7min