When a data collection and/or analysis project is distributed amongst members of the public, the project is often referred to as citizen science. Members of the public are recruited to collect data or a dataset is made publicly available and members of the public will analyze it. Citizen science is particularly useful for gathering complex observational data simultaneously or performing pattern analysis. Popular citizen science projects include Galaxy Zoo where a series of telescope images has been released and members of the public have been asked to classify the galaxies.