47 Tucanae, located in the constellation Tucana (the toucan), is the second largest known globular cluster. A globular cluster is a star cluster that's so massive that gravity pulls it together into a spherical shape. Globular clusters are also very old, usually older than the galaxies of which they're now a part.
This is a gorgeous picture, a
digital art work by Felix Cheung depicting the toucan and 47 Tucanae. It's one of a set of screen savers based on the Southern Birds constellations.