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Since the 1980's discovery of the large (2x10^9 Msun) intergalactic cloudknown as the Leo Ring, this object has been the center of a lively debate aboutits origin. Determining the origin of this object is still important as wedevelop a deeper understanding of the accretion and feedback processes thatshape galaxy evolution. We present HST/COS observations of three sightlinesnear the Ring, two of which penetrate the high column density neutral hydrogengas visible in 21 cm observations of the object. These observations provide thefirst direct measurement of the metallicity of the gas in the Ring, animportant clue to its origins. Our best estimate of the metallicity of the ringis ~10% Zsun, higher than expected for primordial gas but lower than expectedfrom an interaction. We discuss possible modifications to the interaction andprimordial gas scenarios that would be consistent with this metallicitymeasurement.

Unravelling the Mysteries of the Leo Ring: An Absorption Line Study of an Unusual Gas Cloud