Dr Karen Masters explains how different galaxies are being classified using crowdsourcing, as part of the Galaxy Zoo project. Based at the University’s Institute of Cosmology and Gravitation, Dr Karen Masters specialises in galaxy formation and evolution and is a Senior Lecturer in Astronomy. Credits to Sloan Digital Sky Survey and to Elizabeth Jenkins for galaxy illustrations. Follow the link to our Did You Know? pages to learn more (http://bit.ly/1BGxoBW)