Kepler_186f is an Earth-like exoplanet discovered by NASA's Kepler Space Telescope. It is located about 490 light-years away in the constellation Cygnus and is believed to be the first exoplanet discovered that is similar in size to Earth. It is also the first planet found to be within the habitable range of its host star, suggesting it may be capable of supporting life. Kepler_186f has a radius 1.1 times that of Earth and a slightly lower surface temperature of around -24C. Its host star, which is an M-type dwarf star, has a mass of only one-third of that of our Sun. Kepler_186f is an exciting new discovery for astronomers, as it may be a potential home for alien life.