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Kepler-186f (also known by its Kepler object of interest designation KOI-571.05) is an exoplanet orbiting the red dwarf Kepler-186, about 500 light-years (150 parsecs; 4.7 quadrillion kilometres) from Earth. It was the first planet with a radius similar to Earth's to be discovered in the habitable zone of another star.
The Kepler space telescope was a space telescope launched by NASA to discover Earth-size planets orbiting other stars. Named after astronomer Johannes Kepler, the spacecraft was launched on March 7, 2009, into an Earth-trailing heliocentric orbit. ... Only planets whose orbits are seen edge-on from Earth could be detected.
