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We present 4-meter Kitt Peak telescope and 6.5-meter MMT spectrophotometry ofthe extremely low-metallicity galaxy SBS 0335-052W, the western companion ofthe blue compact dwarf galaxy SBS 0335-052E. These observations have beencombined with published 10-meter Keck data to derive for the brightest regionof SBS 0335-052W an oxygen abundance 12+logO/H=7.12+/-0.03. This makes SBS0335-052W the lowest metallicity star-forming galaxy known in the localuniverse. Using a Monte Carlo technique, we fit the spectral energydistribution of SBS 0335-052W to derive the age of the oldest starscontributing to its optical light. We find that star formation in SBS 0335-052Wbegan less than 500 Myr ago, making it a likely nearby young dwarf galaxy.Comment: 13 pages, 3 figures, accepted for publication in the Astrophysical  Journa

SBS 0335−052W: The Lowest Metallicity Star‐forming Galaxy Known