Three nearly Earth-size planets found orbiting nearby star: One in 'Goldilocks' zone

NASA's Kepler Space Telescope has discovered a star with three planets only slightly larger than Earth. The outermost planet orbits in the 'Goldilocks' zone -- where surface temperatures could be moderate enough for liquid water and perhaps life to exist. The star ranks among the top 10 nearest stars known to have transiting planets. The star's close enough for astronomers to study the planets' atmospheres to determine if they could possibly be conducive to life.