Radio Galaxy Zoo (RGZ) is a citizen-science project that uses multi-wavelength data to locate supermassive black holes in distant galaxies. The original RGZ ran from 2013 to 2019, and enabled visual inspection by volunteers of over 170,000 radio sources to determine the host galaxy of the radio emission and the radio morphology. The radio images were drawn from the Australia Telescope Large Area Survey (ATLAS), and the Faint Images of the Radio Sky at Twenty-Centimeters (FIRST) survey, with infrared data from Wide-field Infrared Survey Explorer (WISE) and the Spitzer Space Telescope.

Following the success of the original program, Radio Galaxy Zoo: EMU has been launched, working with the radio images from the Evolutionary Map of the Universe (EMU) Survey from the Australian SKA Pathfinder (ASKAP). Citizen scientists will take on the challenge of describing what each radio source looks like, using a preselected list of descriptors or tags. A major goal of EMU is to separate powerful radio galaxies, which often have jets and lobes, from star-forming-galaxies, in which the radio emission arises from supernova explosions and other processes accompanying the formation of stars.