I want to offer two answers: First, astronomers have only found one other solar system containing eight confirmed planets: Kepler-90, otherwise known as 2MASS J18574403+4918185. The name Kepler-90 derives from the now defunct Kepler mission (2009–2018) that discovered these worlds through the transit method. (This method involves observing the slight and periodic light diminishments resulting … Continue reading What’s the Approximate Number of Solar Systems that Have More than 8 Planets?