An artist's concept of Kepler-186f, an Earth-size planet found orbiting in the habitable zone of its parent star. A planet like Kepler-186f with a smaller orbit than Earth's could be at risk of having only one hemisphere face toward the star, with the other hemisphere always facing away...
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NASA's Kepler Telescope is a planet-hunting instrument specifically designed to search for worlds orbiting distant stars. During its primary mission, it uncovered thousands of possible worlds "out there" and showed astronomers that planets are quite common in our galaxy. However, does that mean tha...