Kepler-186f

Kepler-186f

This artist's movie illustrates Kepler-186, a five-planet system located about 500 light-years from Earth in the constellation Cygnus, from an overhead view. The green circular band depicts the habitable zone-a range of distances from a star where liquid water might pool on the planet's surface. The blue streak shown in the habitable zone depicts the orbital path of Kepler-186f -- the first validated habitable-zone, Earth-size planet around another star. Kepler-186f orbits its star once every 130 days and receives one-third the energy that Earth does from the sun, placing it near the outer edge of the habitable zone. Kepler-186f is less than 10 percent larger than Earth in size, but its mass, composition and density are not known. While scientists don't know the density of the planet, previous research suggests that a planet the size of Kepler-186f is likely to be rocky. This video contains no sound. 

NASA Ames/SETI Institute/JPL-Caltech