“Into Saturn’s Rings” by David A. Hardy, the cover art for a 1996 edition of 2001: A Space Odyssey. I posted this before, but the image processing I used almost obliterated the rings. So here’s the raw image (scanned from Hardyware). An alternate version can be seen at the Science Photo Library.
Download Original Image: 2550×7902px - JPG, 2.70 MB