A conference was held between 10–12 July 2017 at St. Catherine's College, Oxford, to recognise the tenth anniversary of the start of Galaxy Zoo in July 2007. Co-founder Chris Lintott stated: "What started as a small project has been completely transformed by the enthusiasm and efforts of the volunteers... It has had a real impact on our understanding of galaxy evolution." 125 million galaxy classifications resulting in 60 peer reviewed academic papers from at least 15 different projects have been made since July 2007. Discoveries include:Hanny's Voorwerp, Green pea galaxies and more recently objects known as 'Yellow Balls'. On the conference Twitter feed, #GZ10, it states that 10 of the 60 papers have over 100 citations the Astrophysics Data System in 10 years. Karen Masters, an astrophysicist at Portsmouth University and project scientist for GZ stated: "We're genuinely asking for help with something we cannot do ourselves and the results have made a big contribution to the field." As a result of GZ's success, the citizen science web portal Zooniverse was started, which has since hosted a 100 projects.