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Galaxy Zoo 2 (GZ2) was a Zooniverse project to classify some of the brightest galaxies from Sloan Digital Sky Survey through crowd-sourcing. It was the follow-on to the original Galaxy Zoo which classified satellites in SDSS. Galaxy Zoo 2 produced about 60 million classifications of 250,000 galaxies. Currently, the name Galaxy Zoo is used as an umbrella name for a succession of such galaxy-identification projects.