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We present the results from the first two years of the Planet Hunters TESScitizen science project, which identifies planet candidates in the TESS data byengaging members of the general public. Over 22,000 citizen scientists fromaround the world visually inspected the first 26 Sectors of TESS data in orderto help identify transit-like signals. We use a clustering algorithm to combinethese classifications into a ranked list of events for each sector, the top 500of which are then visually vetted by the science team. We assess the detectionefficiency of this methodology by comparing our results to the list of TESSObjects of Interest (TOIs) and show that we recover 85 % of the TOIs with radiigreater than 4 Earth radii and 51 % of those with radii between 3 and 4 Earthradii. Additionally, we present our 90 most promising planet candidates thathad not previously been identified by other teams, 73 of which exhibit only asingle transit event in the TESS light curve, and outline our efforts to followthese candidates up using ground-based observatories. Finally, we presentnoteworthy stellar systems that were identified through the Planet Hunters TESSproject.

Planet Hunters TESS II: Findings from the first two years of TESS