NASA's Kepler mission founds 1st Earth size planet

Our galaxy is full of billions of stars. But only a single planet is known to us which has life on it. Are there also other planets where life can survive like that of our earth? The Kepler Space Telescope is in search of such planets.The Kepler has successfully found a planet,the first validated Earth-size planet which is named as Kepler-186f  which is about 550 light-years (or nearly 5.298×10¹⁵ km).

This image compares the Kepler-186 system and our solar system.The Kepler-186 system consists of five planets and a M dwarf, a star which is half size of mass of the sun.The five planets Kepler-186b, Kepler-186c, Kepler-186d, Kepler-186e and Kepler-186f orbits around the star.

The size of the four planets expect Kepler-186f measure less than fifty percent the size of Earth. Kepler-186f orbits its star once every 130 days, receiving one-third the heat energy that Earth does from the sun. Where as Kepler-186b, Kepler-186c, Kepler-186d and Kepler-186, orbit every 4, 7, 13 and 22 days, respectively, which makes them vary hot and makes them imperfect for life.

As Kepler-186f takes 130 days to complete one orbit so it palaces it in a habitable zone and can have liquid water.