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We present the data release for Galaxy Zoo 2 (GZ2), a citizen science projectwith more than 16 million morphological classifications of 304,122 galaxiesdrawn from the Sloan Digital Sky Survey. Morphology is a powerful probe forquantifying a galaxy's dynamical history; however, automatic classifications ofmorphology (either by computer analysis of images or by using other physicalparameters as proxies) still have drawbacks when compared to visual inspection.The large number of images available in current surveys makes visual inspectionof each galaxy impractical for individual astronomers. GZ2 uses classificationsfrom volunteer citizen scientists to measure morphologies for all galaxies inthe DR7 Legacy survey with m_r>17, in addition to deeper images from SDSSStripe 82. While the original Galaxy Zoo project identified galaxies asearly-types, late-types, or mergers, GZ2 measures finer morphological features.These include bars, bulges, and the shapes of edge-on disks, as well asquantifying the relative strengths of galactic bulges and spiral arms. Thispaper presents the full public data release for the project, including measuresof accuracy and bias. The majority (>90%) of GZ2 classifications agree withthose made by professional astronomers, especially for morphological T-types,strong bars, and arm curvature. Both the raw and reduced data products can beobtained in electronic format at http://data.galaxyzoo.org .

Galaxy Zoo 2: detailed morphological classifications for 304,122 galaxies from the Sloan Digital Sky Survey