NASAs Kepler mission announced they discovered exoplanet Kepler-452b, the most Earth-like planet theyve seen yet. The planet has spent 6 billion years in .\rbr\rbrMission Pluto 2015 || New Horizons Kepler 2015 || Documentary universe || National geographic,Mission Pluto 2015,Kepler,New Horizons Kepler 2015 .\rbr\rbrNational Geographic Documentary - Mission Pluto 2015 New Horizons kepler 452b - Documentary univers New Horizons is an interplanetary space probe that .\rbr\rbrNASA New Horizons - Pluto mission 2015 || kepler 452b planet (Documentary National Geographic) NASAs Kepler mission announced they discovered .