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Kepler-186f Research Papers

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Kepler-186f Could be 'Earth's cousin’
Kepler-186f is an ‘Earth cousin’ rather than an ‘Earth twin’ because it orbits a red dwarf star (also known as an M dwarf), a type of star much smaller and dimmer than Earth's own sun. The newfound exoplanet is probably one of many Earth cousins out there, researchers said. The Kepler-186 planetary system lies in the direction of the constellation Cygnus, about 500 light-years away.
Kepler-186f orbits its parent M dwarf stars once every 130-days and receives 1/3 the energy that Earth gets from the sun, placing it nearer the outer edge of the habitable zone. On the surface of Kepler-186f, the brightness of its star at high noon is only as bright as our sun appears to us about an hour before sunset. The system

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