My reason for nominating is simple: it's gorgeous. It's an entirely natural photograph, not an artificial montage. The black band on Saturn is the shadow cast by its rings. The picture as a whole gives a great indication of the relationships between Saturn, its rings and its moons.
There's a tif on the source page if you want to recompress it yourself. I don't see any glaring artifacts, however. (Support.) —Cryptic(talk)02:50, 30 October 2005 (UTC)
Good idea. I went ahead and recompressed it at a better level from the TIFF. It looks slightly better now. Rhobite03:01, 30 October 2005 (UTC)