Kepler-186f is a exoplanet that goes around the red dwarf star Kepler 186. It is over 580 light years away in the Cygnus constellation. Kepler-186f was discovered in 2014 by the Kepler spacecraft. It is in the habitable zone of its star, so liquid water may exist on its surface. It is known for being the first Earth-sized exoplanets in the habitable zone of a star. 