By the end of its mission, Kepler had discovered 2,662 extrasolar planets, about two-thirds of all planets then known. One of these,Kepler-22b, has a radius 2.4 times that of Earth and was the first planet found within thehabitable zoneof a star like the Sun. Kepler-20e and Kepler-20...
Kepler-22b, that was the first to be found in thehabitable zoneof astarlike theSun. They also discovered the first Earth-sized extrasolar planets,Kepler-20e andKepler-20f (with radii 0.87 and 1.03 times the radius of Earth, respectively). By the end of its mission in 2018, Kepler had di...