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Galaxy Zoo is an ongoing research project to classify millions of galaxies. The website has a short tutorial to teach the user how to classify the galaxies. Once the user has passed a trial proving the ability to do so, the user is allowed to create an account and save the classified to Galaxy Zoo's database. The images being classified come from the SDSS (Sloan Digital Sky Survey).
<a href="https://www.compadre.org/astronomy/items/detail.cfm?ID=5645">Sloan Digital Sky Survey. Galaxy Zoo. Seattle: Sloan Digital Sky Survey, September 6, 2007.</a>
Sloan Digital Sky Survey. Galaxy Zoo. Seattle: Sloan Digital Sky Survey, September 6, 2007. https://www.zooniverse.org/projects/zookeeper/galaxy-zoo/ (accessed 11 October 2026).
%0 Electronic Source %D September 6, 2007 %T Galaxy Zoo %I Sloan Digital Sky Survey %V 2026 %N 11 October 2026 %8 September 6, 2007 %9 text/html %U https://www.zooniverse.org/projects/zookeeper/galaxy-zoo/
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