Kepler 186F Sun. It's the fifth planet in its planetary system; This places the planet near the outer edge of the habitable zone.
Red dwarfs emit far less energy than the sun, as a result kepler 186f only receives about a third of the sunlight we receive on earth.
The mass of the planet is not known, therefore one can only speculate about the planet's composition. A year on kepler 186f would only be 130 days. Its star is much cooler and redder than our sun. Kepler 186f orbits a red dwarf star with around half the mass of the sun, red dwarfs are by far the most common type of star in our galaxy.
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