Thousands of citizen scientists were involved with a project called Exoplanet Explorers (part of Zooniverse). They worked on Kepler data in 2017, and through their efforts a four-planet system was discovered. It was named K2-138, and since then a fifth planet was found, with a possible sixth. This is the first multi-planet system discovered entirely through crowdsourcing.
Here is an
artist's concept of K2-138. All five planets have orbital periods shorter than 13 days and are incredibly hot, ranging from 800 to 1,800 degrees Fahrenheit.