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Galaxy Zoo. 2013. [http://www.galaxyzoo.org/ Galaxy Zoo]. (Experience a privileged glimpse of the distant universe, observed by the Sloan Digital Sky Survey and Hubble Space Telescope. Classify Galaxies: To understand how galaxies formed we need your help to classify them according to their shapes. If you're quick, you may even be the first person to see the galaxies you're asked to classify.). galaxyzoo.org.
Useful Science. 2014. [http://usefulscience.org/ Useful Science]. usefulscience.org.
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