The discovery of Kepler-186f is a huge undertaking in discovering planets like our planet Earth. This planet is called Kepler-186f and it is one of five planets that have been captured so far. by NASA's Kepler space telescope in a circle around the star Kepler-186. This star is smaller and cooler than the Sun, of the type called an M dwarf or red dwarf, and all of the planets it refers to are also small, with sizes less than 1.5 times the measurement of Earth. The planet Kepler-186f is the most modest, lying within 10% of Earth's measurement and orbiting farthest from the host star, within the habitable zone. This is the location around a star within which a planet can support fluid water on its surface if atmospheric conditions are favorable. The planetary structure Kepler-186 lies toward the celestial body Cygnus, about 500 light years away. (planet Astronomy space explora)Figure 1. Kepler-186f is less than ten percent the size of Earth. At one time, a small number of Earth-sized planets, for example Kepler-20e, were discovered. However, all previously known Earth-sized planets circulate...