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Sagittarius Dwarf Irregular Galaxy

The Sagittarius Dwarf Irregular Galaxy, SagDIG, is a small galaxy in the Local Group. It has relatively few elements heavier than helium. This lack of heavy elements might mean that SagDIG is very young, with its component stars having little time to create and disperse massive elements. Conversely, its diminutive size could indicate that it formed in the early universe, a surviving building block of modern large galaxies. The image captures this small, intriguing galaxy.